Sign In
Air Quality

Pollution Control Services' (PCS) Outdoor Air Program conducts activities that include complaint response and investigations, monitoring activities, emissions events investigations, programmatic inspections and permit reviews. View the current air quality forecast.

Emmissions Tank Venting photo

Complaint Response and Investigations

Responding to complaints and conducting investigations is one of PCS’ highest priorities. PCS has historically relied on citizen complaints and enforcement of the Nuisance Rule and Outdoor Burning Rule to address air pollution in Harris County. For more information, view our Field Services Page.






Emissions Dust from Traffic

Programmatic Inspections

PCS also conducts inspections that focus specifically on certain types of facilities that have the potential to impact nearby communities. Harris County is in a nonattainment area of the EPA’s 8-hour National Ambient Air Quality Standard for ozone. Facilities such as paint booths, gas stations, and storage tank facilities are common sources of ozone forming pollutants that PCS investigates. In addition, PCS focuses on sources of particulate, or what may be more commonly known as smoke or dust.  PCS regularly inspects particulate sources such as rock crushers, concrete batch plants and outdoor burning operations.


Air Monitoring for Particulate

Monitoring Activities

Ozone is extensively monitored in Harris County. In the early 2000s PCS contributed to the regional ozone monitoring network by installing 12 ozone monitors. These monitors were installed in strategic locations to provide a more comprehensive picture of overall air quality in Harris County, specifically in areas lacking ozone data. PCS dedicates staff to ensure these monitors collect quality data. To date, all 12 of the monitors are still in use and the data being collected can be viewed on the TCEQ’s monitoring website. For more information, view our Ozone Page.


PCS also utilizes multiple types of handheld monitoring equipment during certain activities, inspections, and special projects.



Emissions Events

On occasion, facilities in Harris County experience what is referred to as an emissions event. An emissions event is an upset event or unscheduled maintenance, startup, or shutdown activity that results in unauthorized emissions of air contaminants from one or more points at a facility. These unscheduled events may include smoking flares, releases from storage vessels or process areas, and fires. These events can result in large quantities of air contaminants being released and possibly impact nearby communities. PCS has assigned staff to specifically investigate emissions events and work with the facilities in an effort to reduce their occurrence and impact.


Permit Review

The Texas Commission on Environmental Quality is responsible for issuing air permits regulating facilities that emit air pollution. These permits can be for both major and minor stationary sources of air pollutants and specify emission limits and requirements for construction and operation. Permit conditions also specify the emission testing and monitoring requirements applicable to each source.  For more information, view our Permits and Technical Services Page.

Hazards and Risks After A Fire 

Fire and explosion accidents are of major concern to the owners and operators of many industries, residents of Harris County, and to Government agencies like PCS. Although incidents may be unpredictable, we can prepare before an event happens. Please review the following reports and fact sheets to learn the risks and how to prevent exposure to air pollution during an incident.






If you live in the unincorporated area of Harris County or within the city limits of any city in Harris County, except Houston, you can call us at (713) 920-2831, 24 hours per day.
If you live within Houston City limits, call 311.  Call (832) 393-5730 to report pollution within the City of Houston if you are calling from a non-Houston phone number.
If you live outside Harris County, call the TCEQ at (713) 767-3500.

Your name will be kept confidential.


Air Quality
If you live in the unincorporated areas of Harris County you can burn trash and leaves produced at your residence if you do not have regular garbage service provided by a government agency. You should check your deed restrictions also. You cannot burn any material generated by a business. If you live inside the Houston City Limits contact the Bureau of Air Quality Control at (713) 640-4200 for information on burning. If you live inside the city limits of any other city, call your city health department or fire marshal.

You may not cause a nuisance to your neighbors under any circumstances.


Air Quality

​​Harris County does not issue any air permits. The state agency Texas Commission on Environmental Quality (TCEQ) is the permitting authority. Pollution Control Services coordinates with both the TCEQ Region 12 Office located in Houston (713) 767-3500 and the Central Office located in Austin (512) 239-1000 concerning activities that require and issuance of air permits.


Air Quality

The EPA has designated Harris County as being in moderate nonattainment of its 8-hour ozone standard. Harris County participates with other state and local agencies in maintaining a monitoring network to provide the public with current ozone data and advisories.

Ozone (O3) is a compound containing three oxygen atoms. Molecules of normal oxygen (O2) are composed of two oxygen atoms. Ozone can be found in the upper atmosphere and at ground level. It occurs naturally in the upper atmosphere where it blocks harmful UV radiation. It forms at ground level when pollutants react to form photochemical smog. Ozone is highly reactive and at high concentrations it may corrode metals, degrade plastics, and cause respiratory irritation. For more information, view our Ozone Page.


Air Quality
Particulate matter is the term for particles found in the air including dust, dirt, smoke, soot and liquid droplets. Particles can be suspended in the air for long periods of time. Some particles are large or dark enough to be seen as dust or smoke. Others are so small that they can be seen only with an electron microscope. Some particles are directly emitted into the air. They come from a variety of sources such as smoking vehicles, construction sites, tilled fields, unpaved roads, stone crushing, and open burning. Other particles are formed in the air from chemical reactions of gases in the presence of sunlight and water vapor. They result from emissions of sulfur dioxide, nitrogen oxides, ammonia, and volatile organic compounds-gases emitted by cars, power plants, industrial plants, gasoline dispensing facilities, painting operations, and natural sources. For more information follow this link.
Air Quality

The Federal Clean Air Act regulates 187 chemicals that are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects, or adverse environmental effects.

Listed hazardous air pollutants include benzene, which is widely used in the United States; it ranks in the top 20 chemicals for production volume. Some industries use benzene to make other chemicals that are used to make plastics, resins, and nylon and synthetic fibers. Benzene is also used to make some types of rubbers, lubricants, dyes, detergents, drugs, and pesticides. Benzene is also a natural part of crude oil, gasoline, and cigarette smoke. For more information follow this link.

1,3-Butadiene is a chemical made from the processing of petroleum. Most of the 1,3-Butadiene manufactured is used in the production of synthetic rubber. It is also used in the production of plastics and acrylics. These synthetic materials are used to manufacture automotive tires and tire products, automotive hoses, belts, seals, and gaskets. It is also used as a chemical intermediate in the production of some fungicides, and in the manufacture of latex adhesives, nylon carpet backing, paper coatings, pipes, conduits, electrical components and luggage. Small levels of 1,3-Butadiene are found in gasoline. For more information follow this link.

Dioxin, asbestos, toluene, and metals such as cadmium, mercury and chromium compounds are also air toxics. For more information on HCPCS’ Environmental Toxins Control Program, including Air Toxics, please view our Environmental Toxins Control Program Web Page.


Air Quality


For suggestions or comments regarding this site please email us at

The information contained in this site was valid at the time of posting. Harris County assumes no liability for damages incurred directly or indirectly as a result of errors, omissions or discrepancies. Moreover, Harris County is not responsible for the content nor endorses any site which has a link from this page. For additional information please review our Privacy Policy and our Accessibility Statement.