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Knozone is a public outreach initiative of the Office of Sustainability. Through education, resources, and tips for taking action, Knozone works with residents and businesses to improve local air quality and make Central Indiana one of the midwest's most sustainable, livable regions. 

For more information on air quality in Central Indiana, visit www.knozone.com.

​​Air Monitoring Information

The Office of Sustainability collects ambient air quality data in and around Marion County for pollutants which have National Ambient Air Quality Standards (NAAQS). These pollutants are referred to as the criteria pollutants and include carbon monoxide (CO), ozone (O3), sulfur dioxide (SO2), nitrogen dioxide (NO2), particulate matter 10 micron (PM10), particulate matter 2.5 micron (Fine Particles), and lead (Pb).

The air quality standards are set at levels to protect the public health. Air monitoring is conducted by the Indiana Department of Environmental Management (IDEM) to assure compliance of those standards. The gaseous pollutants (CO, O3, SO2) are measured 24 hours a day, 7 days a week by IDEM staff. The particulate type pollutants (Fine Particles, PM10, Pb) are collected over a 24 hour period and measured once every day (Fine Particles) to every 6th day (PM10 and Pb). Each year the agency collects nearly 160,000 total air measurements in cental Indiana.

Up to hour air quality information and readings can also be checked by calling our air quality phone line at 317-327-4AIR.  Forecasted AQI levels are also reported.


 ​The Indianapolis Air Board

The Indianapolis Air Pollution Control Board is a nine member board responsible for enhancing and improving the air quality for the City of Indianapolis and Marion County, Indiana. 

The Board membership is composed from the following professions: A professional engineer, registered in the State of Indiana; A physician, licensed in the State of Indiana; An attorney, admitted to the Indiana Bar; A member knowledgeable in solid waste disposal; A member knowledgeable in fuel technology and combustion; A member knowledgeable in process manufacturing; A member representing industry; A member representing labor; and A member representing the public at large.  Five of the members are appointed by the Mayor of Indianapolis and four are appointed by the City-County Council.  All members serve a four year term.

The Board holds public meetings on the second Thursday of each month.  The meetings are held in Room 107 of the City-County Building at 9:30 a.m.  Copies of the agenda can be requested from our office at 317-327-2234 or through e-mail (contact OES)   

To view the videos of meetings or current and previous air pollution board packets, click here

Ordinances and Regulations

Listed below are environmental regulations. Please click on the regulation number to access a pdf version of the file to read or download. A copy of the state rules can be found here.

Regulation 1    - General Provisions

Regulation 2    - Permits
Regulation 3    - Monitoring Requirements
Regulation 4    - Burning Regulations
Regulation 5    - Opacity
Regulation 6    - Particulate Emission Limitations

Regulation 6.5  -Particulate Emission Limitations for Indianapolis/ Marion County

Regulation 7    - Sulfur Dioxide Emission Limitations
Regulation 8    - Volatile Organic Compound Rules
Regulation 9    - Carbon Monoxide Emission Rules
Regulation 10  - Nitrogen Dioxide Rules
Regulation 11  - Emission Limitations for Specific Types of Operations
Regulation 12 - New Source Performance Standards
Regulation 13  - Motor Vehicle Tampering and Fuel Switching
Regulation 14  - Emission Standards for Hazardous Air Pollutants
Regulation 15  - Reserved
Regulation 16  - Reserved
Regulation 17  - Public Records
Regulation 18  - Reserved
Regulation 19  - Reserved
Regulation 20  - Hazardous Air Pollutants
Regulation 21  - Acid Deposition Control
Regulation 22  - Stratospheric Ozone Protection
Regulation 23  - Reserved
Regulation 24  - Reserved
Regulation 25  - Reserved
Regulation 26  - Reserved
Regulation 27  - Reserved
Regulation 28  - Reserved
Regulation 29  - Reserved
Regulation 30  - Hearing Examiner for the Air Pollution Control Board
Regulation 31  - Limited Liability for Failure to Obtain Permit
Chapter 511    - Air Pollution Control
Chapter 671.5  - Sewers and Sewage Disposal