High City 2G Disposable – Complete Product Guide, Flavors, Specifications, Verification, Storage & FAQs
The High City 2G Disposable is a two-gram all-in-one cannabis vape product marketed around portability, extended capacity, rechargeable hardware, and strain-inspired flavor profiles. Consumers searching for High City 2G Disposable, High City Disposable 2G, High City vape 2 gram, High City 2G flavors, High City Disposable real or fake, or High City 2G Disposable review are often trying to determine much more than the name of the device. Important questions include how much concentrate it contains, whether it is rechargeable, what type of extract is used, whether the heating element is ceramic, what flavors are available, how to identify legitimate batch information, and how the device compares with conventional 1-gram cartridges and disposables.
A current retailer listing identifies the High City 2G Disposable as a 2-gram all-in-one device and states that it uses draw activation, an integrated ceramic heating element, a rechargeable internal battery with USB-C charging, a visible oil reservoir, and a distillate-and-terpene formulation. The same page advertises third-party testing but does not publicly display a batch-specific Certificate of Analysis in the accessible product information.
That distinction matters. Product descriptions can provide a useful starting point, but a retailer claim is not equivalent to independent laboratory verification. Cannabis vape products should ultimately be evaluated through their physical packaging, batch information, responsible manufacturer or licensee, ingredient disclosure, applicable regulatory labels, and laboratory documentation.
This guide explains the currently available information about the High City 2G Disposable, including its stated specifications, flavor profile categories, extract terminology, rechargeable hardware, authentication checks, storage guidance, comparisons with other vape formats, and frequently asked questions.
What Is the High City 2G Disposable?
The High City 2G Disposable is marketed as an all-in-one cannabis vaporizer containing approximately 2 grams of extract. Unlike a conventional 510-thread cartridge, an all-in-one device combines the reservoir, heating element, battery, airflow system, and mouthpiece within one piece of hardware.
The 2G format provides twice the stated fill weight of a traditional 1-gram device. It is important, however, to distinguish product weight from cannabinoid potency.
Two grams equals approximately 2,000 milligrams of total material by weight, but that does not mean the product contains 2,000 milligrams of THC. THC content depends on the cannabinoid concentration of the oil and should be determined from properly matched laboratory results.
The accessible High City product listing describes the unit as draw activated, which means the heating element is intended to activate when airflow is detected rather than requiring a conventional firing button. It also describes the product as rechargeable through USB-C.
Consumers should verify these characteristics on the exact device they have because hardware designs and manufacturing runs can change.
High City 2G Disposable Specifications
The following table summarizes information currently associated with the product while distinguishing retailer-stated specifications from information that remains batch dependent.
| Specification | Available Information |
|---|---|
| Product Name | High City 2G Disposable |
| Product Category | All-in-one cannabis vaporizer |
| Stated Capacity | 2 grams |
| Approximate Total Material Weight | 2,000 mg |
| Activation | Retailer states draw activated |
| Heating Element | Retailer states ceramic heating core |
| Battery | Internal rechargeable battery |
| Charging Connection | Retailer states USB-C |
| Oil Window | Retailer describes visible reservoir |
| Extract Description | Distillate/terpene blend according to retailer |
| Airflow | Retailer describes dual-path airflow |
| Flavor Format | Mixed flavors are advertised |
| Individual Flavor List | Not publicly confirmed in the accessible listing |
| Exact THC Percentage | Batch specific |
| Exact Terpene Percentage | Batch specific |
| Battery Capacity | Not publicly confirmed |
| Coil Resistance | Not publicly confirmed |
| Operating Voltage | Not publicly confirmed |
| Puff Count | No independently verified fixed number |
| Laboratory Testing | Retailer claims third-party testing |
| Public Batch COA | Not located in the available product information |
The current product page specifically states a 2-gram capacity, draw activation, ceramic heating element, rechargeable USB-C hardware, and distillate/terpene extract description.
Specifications that are not clearly documented should not be invented merely to make a product page appear more complete.
Understanding the 2-Gram Capacity
The phrase High City 2G Disposable primarily describes the stated quantity of concentrate inside the device.
A two-gram disposable contains approximately twice the material of a one-gram disposable. The larger capacity can make hardware design particularly important because the battery and heating element must remain functional through a greater quantity of oil.
Capacity alone does not determine:
- THC percentage
- CBD percentage
- Total cannabinoids
- Terpene concentration
- Product purity
- Laboratory compliance
- Number of puffs
- Battery duration
- Overall hardware reliability
Those characteristics need separate measurements or documentation.
For example, two 2G disposables can contain exactly the same weight of concentrate while having substantially different cannabinoid profiles.
What Type of Extract Is in High City 2G Disposable?
One current retailer describes the High City 2G Disposable as containing a high-purity distillate and terpene blend.
Distillate is a highly refined cannabis concentrate in which cannabinoids are separated and concentrated through processing. Terpenes may then be incorporated to create flavor and aroma characteristics.
However, terms such as “high purity” should be treated as marketing descriptions unless supported by appropriate analytical testing.
A product can only be meaningfully evaluated for cannabinoid concentration and contaminants through a laboratory report corresponding to the particular batch.
Consumers should therefore avoid assuming that every High City 2G Disposable contains exactly the same cannabinoid concentration or terpene formulation.
High City 2G Disposable Flavors
Flavor information is one area where publicly available documentation is currently limited.
The accessible retailer page sells the High City 2G Disposable in mixed-flavor packages, including quantities described as 5, 10, 25, 50, and 100 mixed-flavor packs. However, the product page does not expose an individual list of confirmed flavor names in its accessible text.
For that reason, a responsible High City 2G Disposable flavor guide should not invent flavor names.
Consumers should use the exact packaging, current manufacturer catalog, or verified retailer inventory to determine the flavor associated with an individual unit.
Indica-Style Flavor Profiles
The current product description groups part of the lineup under an Indica profile and characterizes that category with earthy, pine, berry, and gas-style flavor notes. It associates the profile with terpenes such as myrcene and linalool. These descriptions come from the retailer rather than an independently published batch-specific terpene report.
Because individual products can differ, consumers should not assume that every Indica-labeled High City device contains the same terpene percentages.
Sativa-Style Flavor Profiles
The retailer describes its Sativa category using citrus, tropical-fruit, sour, and pine-style notes. It references limonene and pinene in connection with this category.
Again, these are broad profile descriptions rather than verified results for every device.
If a package provides a terpene panel, the actual laboratory measurements are more informative than a general Sativa label.
Hybrid-Style Flavor Profiles
The retailer also references Hybrid versions with cream, pepper, fruit, and floral-style characteristics and associates them with caryophyllene and humulene.
Hybrid terminology is widely used in cannabis marketing, but it should not be treated as a standardized predictor of effects.
Cannabinoid content, terpene profile, formulation, dose, tolerance, and individual response all influence the experience.
Why Flavor Names Should Be Verified
Cannabis vape product names frequently change between batches and releases.
A flavor appearing in a photograph, social-media post, reseller listing, or older inventory page may not necessarily be available in the current High City 2G lineup.
For an accurate product catalog, record the flavor exactly as written on the package instead of creating names based on generic descriptions.
Useful information to capture includes:
Flavor name → category → batch number → ingredients → cannabinoid percentage → terpene information → production date.
That approach produces a much more reliable product page than repeating unverified flavor names found across unrelated websites.
How a Ceramic Heating Element Works
The retailer describes the High City 2G Disposable as using an integrated ceramic heating core.
Ceramic materials are commonly used in cannabis vape hardware because porous ceramic can absorb concentrate and distribute heat over a relatively broad surface area.
The purpose of the heating element is to raise the temperature of the extract sufficiently to create an aerosol without directly burning plant material.
Hardware performance can nevertheless vary according to:
- Coil construction
- Electrical resistance
- Battery voltage
- Concentrate viscosity
- Airflow
- Manufacturing tolerances
- Storage temperature
- Frequency and duration of activation
A ceramic coil alone therefore does not establish overall product quality.
Draw-Activated Design
According to the current retailer description, the High City Disposable 2G uses draw activation rather than requiring a firing button.
In a draw-activated device, inhalation creates airflow that is detected by an internal sensor. The sensor activates the heating circuit, which powers the heating element.
This type of configuration is common in all-in-one vaporizers because it minimizes external controls.
If a device does not activate, consumers should first examine the manufacturer instructions rather than repeatedly inhaling forcefully or attempting to dismantle the unit.
Possible hardware problems can include:
- Depleted battery
- Blocked airflow
- Condensation
- Damaged sensor
- Electrical failure
- Internal leakage
- Heating-element failure
A visibly damaged battery-powered device should not be opened or punctured.
Is the High City 2G Disposable Rechargeable?
The available retailer listing states that the device contains a rechargeable internal battery and uses a USB-C charging port.
Rechargeable does not mean refillable.
In this context, rechargeable means the internal battery can receive additional electrical power before the concentrate is depleted.
A disposable device is generally designed so that the oil reservoir itself is not refilled.
Battery specifications such as milliamp-hour capacity and precise charging current were not independently documented in the available listing.
Consumers should therefore follow whatever charging information is printed on the physical packaging.
High City 2G Disposable Airflow
The same product page describes a dual-path airflow configuration, with a primary intake and a secondary airflow route intended to address resistance and condensation.
Airflow matters because cannabis concentrates can become more viscous at lower temperatures.
Condensation may also accumulate within the airway after repeated heating and cooling cycles.
Nevertheless, claims such as “anti-clog” should not be interpreted as a guarantee that a device can never experience restricted airflow.
Any disposable vaporizer can potentially develop performance problems depending on formulation, storage conditions, hardware design, and handling.
High City 2G Disposable Real or Fake: How to Check
Searches for High City 2G Disposable real or fake usually indicate that consumers want a practical authenticity check.
Visual appearance alone is not enough.
A convincing package can be reproduced, and legitimate manufacturers can also redesign packaging.
A stronger verification process examines multiple pieces of information together.
1. Check the Batch or Lot Number
Look for a production batch or lot identifier.
The batch number helps establish traceability between the finished product and the laboratory sample.
If a Certificate of Analysis is supplied, its identifying information should correspond to the device or package.
2. Check the Responsible Manufacturer
The consumer-facing brand may not necessarily be the licensed manufacturer.
Look for the company responsible for manufacturing or distributing the product and any cannabis license information required in the jurisdiction where it is legally sold.
3. Examine Cannabinoid Labeling
Check whether the package identifies THC, CBD, THCA, or other relevant cannabinoids as required by the local regulatory system.
Do not assume that “2G” means a specific THC dose.
4. Examine the QR Code
A QR code is useful only if the information it opens can be validated.
A QR code by itself does not prove authenticity.
After scanning, compare the webpage or laboratory document with the physical package.
5. Match the Certificate of Analysis
A reliable laboratory report should identify the sample and production batch clearly enough for the consumer or distributor to establish a connection.
California, for example, requires regulated cannabis batches to undergo testing before retail sale and reports the results through a Certificate of Analysis. Required testing covers areas including cannabinoids, terpenes, residual solvents, pesticides, heavy metals, microbial impurities, mycotoxins, moisture-related measurements, and foreign material.
Requirements vary between U.S. jurisdictions, so California’s rules should not be assumed to apply nationwide.
What Should a Certificate of Analysis Show?
A cannabis Certificate of Analysis may include information such as:
- Product or sample name
- Batch or lot number
- Laboratory name
- Laboratory license
- Sample identification number
- Date received
- Date tested
- Cannabinoid concentration
- THC or THCA
- CBD or CBDA
- Terpene information
- Residual solvent results
- Pesticide screening
- Heavy-metal testing
- Microbial testing
- Mycotoxin testing
- Pass or fail status
California regulators specifically state that a COA indicates whether a tested batch passes or fails the required analyses.
A COA for another flavor, another batch, or another product does not automatically verify the High City device being examined.
Why Batch Matching Matters
The most useful authenticity check is not simply whether a laboratory report exists.
It is whether the report corresponds to the product.
For example, California’s distribution guidance requires licensed distributors to make sure the COA corresponds to the correct batch and that cannabinoid and terpenoid labeling is consistent with the laboratory documentation.
That principle is useful for consumers regardless of the specific state’s requirements.
Compare:
Package batch number → COA batch number → product name → manufacturer → laboratory → test date → cannabinoid results.
If the numbers do not correspond, the COA should not be treated as verification for that unit.
Red Flags Worth Investigating
Consumers researching High City Disposable authenticity should investigate further when they encounter obvious inconsistencies such as:
- No batch or lot number
- No identifiable responsible company
- Cannabinoid percentages with no supporting documentation
- QR code linking to an unrelated page
- COA for a different product
- Missing legally required warnings
- Contradictory information on different sides of the package
- Broken or altered seals
- Damaged battery housing
- Visible oil leaking through the device
- Unusually poor printing quality
- Important text covered with replacement stickers
One unusual characteristic is not necessarily proof of counterfeiting.
The goal is to establish traceability rather than make an authenticity decision from packaging color alone.
High City 2G Disposable vs 1G Disposable
The most obvious difference is capacity.
| Feature | High City 2G Disposable | Typical 1G Disposable |
|---|---|---|
| Stated Fill | 2 grams | 1 gram |
| Hardware | All-in-one | Usually all-in-one |
| Battery | Retailer describes rechargeable | Depends on model |
| Activation | Retailer states draw activated | Often draw activated |
| Heating Element | Retailer states ceramic | Varies |
| Extract | Retailer states distillate/terpene blend | Varies |
| THC Level | Batch dependent | Batch dependent |
| Flavor Availability | Varies by release | Varies |
| Laboratory Results | Should be batch specific | Should be batch specific |
A 2G device offers more material, but capacity alone does not make it higher quality.
A properly manufactured one-gram device can perform better than a poorly manufactured two-gram device.
Hardware consistency, formulation, testing, traceability, and storage remain important.
High City 2G Disposable vs 510 Cartridge
A traditional 510 cartridge typically contains concentrate and a heating element but relies on a separate reusable battery.
The High City format is marketed as an all-in-one system.
All-in-One Configuration
The battery, reservoir, airway, heating element, and mouthpiece are integrated into the same housing.
510 Cartridge Configuration
The cartridge attaches to a separate compatible battery.
This allows the battery to be retained when the cartridge is empty.
Neither configuration automatically determines extract quality or potency.
Those characteristics depend on the actual oil and laboratory results.
High City 2G Disposable vs Larger-Capacity Devices
Three-gram, four-gram, and even larger disposable formats are increasingly visible across online cannabis and hemp marketplaces.
Capacity should not be treated as the only meaningful comparison.
Larger reservoirs place more demands on:
- Battery endurance
- Charging reliability
- Coil lifespan
- Oil delivery
- Airflow
- Seal durability
- Thermal management
A 2G format can represent a middle ground between conventional 1G hardware and oversized multi-gram devices, but consumers should evaluate documentation and hardware condition rather than assume that more grams automatically provide better quality.
High City 2G Disposable Storage Guidance
Storage affects both concentrate consistency and battery-powered hardware.
Store in a Cool Environment
Avoid prolonged exposure to excessive heat.
High temperatures can change oil viscosity and place additional stress on seals and lithium battery components.
A hot vehicle is therefore not a suitable long-term storage location.
Keep Away From Direct Sunlight
Continuous sunlight can heat the hardware and expose cannabis compounds to light.
A cool, shaded storage area is preferable.
Keep the Device Dry
Electronic vaporizers should be protected from water and excessive moisture.
Do not submerge the device.
Keep Upright When Practical
The retailer recommends upright storage to reduce the possibility of material reaching the airway.
Actual hardware designs vary, so packaging instructions should take priority.
Protect From Physical Damage
Do not crush, puncture, bend, or deliberately dismantle the device.
Lithium-powered electronics can become hazardous when physically damaged.
Keep Away From Children and Pets
Cannabis products should always be stored securely and outside the reach of children and animals.
A colorful box or child-resistant package should not replace secure household storage.
Battery Safety
The rechargeable battery is one of the most important components of an all-in-one disposable.
Do not continue using a device if the housing becomes:
- Swollen
- Cracked
- Punctured
- Excessively hot
- Wet internally
- Severely bent
- Electrically unstable
Do not burn or intentionally open a lithium-powered vape.
If the device is damaged, follow appropriate local battery or electronic-waste disposal guidance.
Common High City 2G Disposable Questions About Hardware
Why Is My High City Disposable Not Hitting?
Possible reasons include a depleted battery, blocked airway, condensation, damaged sensor, or heating-element failure.
Follow the model-specific instructions first.
Avoid inserting metal objects deeply into the airway because internal components may be damaged.
Why Is My High City Disposable Blinking?
Indicator lights can represent different conditions depending on the hardware.
A blinking light may indicate battery status, activation timeout, charging status, or an electrical fault.
Because a manufacturer-level indicator-code guide was not located in the available public documentation, the physical package or manual should be consulted.
Why Does the Oil Look Thick?
Cannabis concentrates naturally change viscosity with temperature.
Cooler temperatures can make oil appear thicker.
Do not expose the device to flames, stovetops, or extreme heating in an attempt to thin the material.
What If the Device Is Leaking?
Stop using severely damaged or leaking hardware.
Oil outside the intended reservoir can indicate a seal or hardware problem.
How Many Puffs Are in a High City 2G Disposable?
There is no reliable universal puff number simply because the device contains two grams.
Puff count is affected by:
- Draw duration
- Heating power
- Airflow
- Coil resistance
- User behavior
- Oil viscosity
- Battery characteristics
A person taking short draws may obtain a different number than someone using longer draws.
For this reason, 2 grams is a more objective product specification than an estimated puff count.
How Long Does a High City 2G Disposable Last?
There is no single answer.
Duration depends on individual use and hardware performance.
A retailer estimates that a 2G unit could last weeks for some usage patterns, but this is not a universal specification and should not be presented as a guarantee.
Product capacity is a measurable figure; individual duration is not.
Is High City 2G Disposable Distillate?
A current retailer describes the product as a distillate/terpene blend.
However, no official manufacturer formulation sheet or batch-specific COA was located in the public information reviewed for this guide.
The physical package and corresponding laboratory results should therefore be used to verify the actual formulation.
Is High City 2G Disposable Live Resin?
The currently accessible product description identifies a distillate-and-terpene formulation rather than explicitly identifying the product as live resin.
Consumers should not label it live resin unless a specific package or verified manufacturer document says so.
Is High City 2G Disposable Liquid Diamonds?
The currently available product listing reviewed for this guide does not establish a Liquid Diamonds formulation.
Therefore, “Liquid Diamonds” should not be added to a High City 2G product description without separate documentation.
Does High City 2G Disposable Have a Ceramic Coil?
A current retailer specifically states that the device uses an integrated ceramic heating core.
Because an official manufacturer specification sheet was not located, this should be presented as a retailer-stated specification rather than an independently verified feature.
Is High City 2G USB-C Rechargeable?
The available listing states that the device uses an internal rechargeable battery and a USB-C charging connection.
Users should inspect their physical device because product revisions can occur.
Does High City 2G Have Buttons?
The same listing describes the device as draw activated and states that no firing button is required.
That characteristic should still be confirmed on the exact hardware version.
What Are the High City 2G Disposable Flavors?
The retailer currently describes mixed-flavor pack options but does not publicly display a complete individual flavor list in the accessible product text.
Until a reliable flavor menu is available, specific flavor names should be taken directly from individual High City packaging rather than invented.
Is High City 2G Disposable Real?
A product cannot reliably be authenticated from its name alone.
Check its manufacturer or responsible licensee, batch number, regulatory labeling, laboratory documentation, packaging consistency, and source.
Does a QR Code Prove It Is Real?
No.
A QR code proves only that the code leads somewhere.
The destination and associated batch information must still be validated.
What THC Percentage Does High City 2G Have?
There is no single confirmed THC percentage that can responsibly be applied to every High City 2G Disposable.
Cannabinoid values should come from the exact package and batch-specific laboratory report.
Is 2G the Same as 2,000 mg THC?
No.
Two grams equals 2,000 milligrams of total product weight.
It does not mean all 2,000 milligrams are THC.
Can High City 2G Disposable Be Refilled?
Nothing in the available product information establishes it as a refillable vaporizer.
A rechargeable disposable generally allows the battery to be recharged, not the reservoir to be refilled.
Should a High City Disposable Be Stored in a Refrigerator?
Unless specifically instructed by the manufacturer, routine refrigeration is generally unnecessary for electronic vape hardware.
A cool, dry indoor environment away from direct sunlight is more practical.
Can High City Disposable Be Left in a Car?
Extended storage in a hot vehicle is not advisable because high temperatures can affect concentrate viscosity, seals, and battery-powered electronics.
What Should Consumers Look for Before Relying on Product Claims?
When evaluating a High City Disposable 2G, focus on traceable facts rather than prominent marketing phrases.
Look for:
Net quantity: Does the package clearly identify the stated two-gram capacity?
Batch identification: Is there a lot or production number?
Responsible company: Is the manufacturer, processor, distributor, or licensee identified where required?
Cannabinoid information: Are THC and other required cannabinoid values shown?
Testing documentation: Can the laboratory report be connected to the same batch?
Ingredients: Does the label explain what the formulation contains?
Warnings: Does the packaging carry the warnings required by the applicable jurisdiction?
Hardware instructions: Are charging and operation details provided?
Package integrity: Is the device properly sealed and free from obvious damage?
These elements provide far more useful information than a logo or product photograph alone.
Frequently Asked Questions About High City 2G Disposable
What is the High City 2G Disposable?
It is marketed as a two-gram all-in-one cannabis vaporizer. A current retailer describes rechargeable USB-C hardware, draw activation, a ceramic heating element, and distillate with terpenes.
How much oil is in High City 2G?
The stated capacity is approximately two grams.
Is High City 2G rechargeable?
A current retailer listing says yes and identifies USB-C charging.
Is High City 2G draw activated?
The same listing says the device uses draw activation and does not require a firing button.
Does High City 2G use ceramic technology?
The retailer describes an integrated ceramic heating core.
What extract is inside High City Disposable?
The accessible listing describes a distillate-and-terpene formulation. Exact cannabinoid composition should be checked on the relevant package and laboratory report.
What High City 2G flavors are available?
Mixed flavors are currently advertised, but the accessible product page does not provide a complete verified flavor-name list.
Is High City 2G a live-resin disposable?
The available listing reviewed here does not establish live resin as the formulation.
Is High City 2G Liquid Diamonds?
The available documentation reviewed here does not establish a Liquid Diamonds formulation.
How can I verify High City 2G Disposable?
Check the batch number, responsible company, applicable license information, cannabinoid labeling, ingredients, QR destination, and Certificate of Analysis.
What should match on the COA?
The product identity, batch number, laboratory information, cannabinoid results, testing date, and other traceability information should correspond with the package.
How should High City 2G Disposable be stored?
Store it securely in a cool, dry location away from excessive heat, direct sunlight, water, children, and pets.
Why does my High City Disposable have restricted airflow?
Possible causes include condensation, changes in oil viscosity, or a hardware problem. Do not aggressively dismantle the device.
Can a damaged High City Disposable still be used?
A device with a swollen battery, cracked housing, severe leakage, puncture, or excessive heat should not continue to be used.
Is a 2G disposable stronger than a 1G disposable?
Not necessarily. Two grams refers to quantity, while strength depends on cannabinoid concentration.
Does more oil mean higher quality?
No. Capacity does not establish formulation quality, hardware reliability, testing compliance, or purity.
High City 2G Disposable Keyword Topics
Important search phrases related to this product include High City 2G Disposable, High City Disposable 2G, High City vape, High City 2 gram Disposable, High City 2G flavors, High City Disposable flavors, High City 2G review, High City Disposable real or fake, High City vape verification, High City 2G COA, High City lab results, High City 2G ceramic coil, High City USB-C disposable, High City rechargeable disposable, High City cannabis vape, High City 2G distillate, High City vape authenticity, and High City 2G specifications.
These phrases should appear naturally only where they help answer a genuine consumer question.
Repeating the same phrase excessively makes content less readable and does not improve the accuracy or usefulness of a product page.
Final Overview
The High City 2G Disposable is currently described by an online retailer as a two-gram all-in-one cannabis vape featuring draw activation, a ceramic heating element, rechargeable USB-C hardware, a visible reservoir, and a distillate-and-terpene formulation. The retailer also markets the product in mixed-flavor packs.
Several important details remain insufficiently documented publicly, including the exact current flavor lineup, battery capacity, operating voltage, coil resistance, cannabinoid percentages, terpene percentages, and a publicly accessible batch-specific laboratory report.
Those gaps are important.
A professional High City 2G Disposable product guide should not replace missing information with invented specifications.
Instead, consumers should confirm the flavor, ingredients, cannabinoid values, manufacturer or responsible licensee, batch identification, and laboratory testing from the exact package they are examining.
Regulated cannabis systems demonstrate why that process matters. In California, for example, licensed cannabis batches must undergo compliance testing before retail sale, and results are documented through Certificates of Analysis covering cannabinoids and multiple contaminant categories.















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