As a precautionary response to COVID-19, Ohio EPA is currently operating with most staff working remotely. If you are working with our staff on a current project and you know the name of the employee you are working with, email them at firstname.lastname@epa.ohio.gov or call them directly. The Agency website has contact information for every district, division, and office. In order to reach us, please contact Ohio EPA’s main phone line at (614) 644-3020 or the main line for the division or office you are trying to reach.

After March 23, our district offices and Central Office will be temporarily closed and will have increasingly limited ability to receive deliveries, plans, etc. All entities are encouraged to submit plans, permit applications, etc., electronically where there are existing avenues to do so, such as the eBusiness Center (eBiz). Please refer to the list of available services on the main eBiz webpage. We encourage you to make use of all that apply, even if you have not used eBiz in the past. Plans under 25 MB can be emailed. For large plans over 25 MB, entities should work with the reviewer/division to upload via LiquidFiles. Directions for submitting docs via LiquidFiles is available on YouTube. We apologize for the inconvenience and thank you in advance for your understanding. If you wish to send hard copies of documents to any of Ohio EPA’s district offices, the best method to ensure we receive these documents is to send them via U.S. Mail. Since all offices are closed, deliveries outside of U.S. Mail (FedEx, UPS) will likely be returned because the offices are closed and deliveries cannot be made.

To report a spill or environmental emergency, contact the spill hotline (800) 282-9378 or (614) 224-0946

National Ambient Air Quality Standards (NAAQS) - Attainment Status

The Clean Air Act, which was last amended in 1990, requires the United States environmental protection agency (USEPA) to set National Ambient Air Quality Standards (40 CFR part 50) for pollutants considered harmful to public health and the environment. The Clean Air Act identifies two types of national ambient air quality standards. Primary standards provide public health protection, including protecting the health of "sensitive" populations such as asthmatics, children, and the elderly. Secondary standards provide public welfare protection, including protection against decreased visibility and damage to animals, crops, vegetation, and buildings.

The USEPA has set National Ambient Air Quality Standards for six principal pollutants, which are called "criteria" air pollutants. Periodically, the standards are reviewed and may be revised. The current standards are listed below. Units of measure for the standards are parts per million (ppm) by volume, parts per billion (ppb) by volume, and micrograms per cubic meter of air (µg/m3).

Fact Sheets

Pollutant Primary/Secondary
Standards
Averaging Time Level Form Ohio Attainment Status
Carbon monoxide primary Eight-hour 9 ppm Not to be exceeded more
than once per year
Full Attainment
One-hour 35 ppm Full Attainment
Lead(Pb) primary
and
secondary
Rolling three-month
Average
0.15 µg/m3 Not to be exceeded Full Attainment
Nitrogen dioxide primary 
and 
secondary
One-year 53 ppb Annual Mean Full Attainment
primary One-hour 100 ppb 98th percentile of 1-hour daily
maximum concentrations,
averaged over 3 years
Full Attainment
Particulate matter PM10 primary 
and 
secondary
24-hour 150 µg/m3 Not to be exceeded more than
once per year on average over 3 years
Full Attainment
PM2.5 primary  One-year 12.0 µg/​m3
(2012 Std.)
annual mean, averaged over 3 years Full Attainment
secondary One-year 15.0 µg/​m3
​(1997 Std.)
annual mean, averaged over 3 years Full Attainment
primary 
and 
secondary
24-hour 35 µg/​m3
(2006 Std.)
98th percentile, averaged over 3 years Full Attainment 
 
Ozone
primary 
and 
secondary
 Eight-hour 0.070 ppm
(2015 std)
Annual fourth-highest daily
maximum 8-hour concentration,
averaged over 3 years
Map
primary 
and 
secondary
Eight-hour 0.075 ppm
(2008 std)
Annual fourth-highest daily
maximum 8-hour concentration,
averaged over 3 years
Full Attainment
primary 
and 
secondary
Eight-hour 0.08 ppm
(1997 std)
Annual fourth-highest daily
maximum 8-hour concentration,
averaged over 3 years
Full Attainment
Sulfur dioxide primary One-hour 75 ppb 99th percentile of 1-hour daily
maximum concentrations,
averaged over 3 years
Map
secondary Three-hour 0.5 ppm Not to be exceeded more than
once per year
Full Attainment