Environmental Protection Agency


  "We Care About Clean Air"


Air Quality - Ozone Alert
Effective Date: August 20, 2017

Evansville, Indiana – August 18, 2017

Air Quality Forecast:  Please be advised that outdoor Ozone levels may reach the “Unhealthy for Sensitive Groups” range established by the United States Environmental Protection Agency (U.S. EPA) for the 8-hour Ozone Standard.

About This Alert: Abundant sunshine, light winds, and an increase of pollutants from car and truck traffic traveling for the eclipse may allow for ozone to breach the 8-hour standard on Sunday. Even if the 8-hour standard isn't exceeded, hourly readings could reach the USG category.

Air Quality Index

Ozone 8-hr average

Good (0-50)

0-54 ppb

Moderate (51 – 100)

55-70 ppb

   Unhealthy for Sensitive Groups (101 – 150)

71-85 ppb

Unhealthy (151 – 200)

86-105 ppb

Very Unhealthy (201 – 300)

106-200 ppb

HAZARDOUS (301 – 500+)

>200 ppb


The U.S. EPA recommends that sensitive groups such as children, older adults, those with respiratory diseases, and people who are active outdoors limit prolonged outdoor exertion especially between the hours of 12:00 and 7:00 p.m. when the highest Ozone concentrations are most likely to occur.

Within a few hours or days, exposure to higher levels of Ozone can cause lung and throat irritation, shortness of breath, and aggravate respiratory diseases such as asthma, emphysema and bronchitis.  For more information about Ozone and your health please go to: http://www.epa.gov/airnow/ozone-c.pdf

To do your share to protect air quality and reduce pollution levels:

  • Conserve energy – turn off lights, reduce air conditioner use, etc.
  • Use Public transit, or limit driving and avoid unnecessary idling and drive-through windows, especially if there are long lines.
  • Postpone refueling your vehicle until after 6:00 p.m.; don’t ‘top-off’ the tank when filling up.
  • Consider using electric or manually operated lawn and garden equipment.   If you use gasoline-powered equipment, try to avoid use between 10:00 a.m. and 6:00 p.m.
  • Limit the use of cleaning fluids, paint thinners or other materials containing volatile organic compounds (VOC).
  • Postpone painting projects or use low-VOC coatings.
  • OPEN BURNING IS PROHIBITED during an air quality alert.  The use of gas and charcoal grills for cooking is permitted, however delaying until after 6 p.m. is recommended.


Near real-time data, forecasts and more information may be found at:  www.airnow.gov and www.evansville.in.gov/epa.

Sign up for daily air quality forecasts and air quality alert notices at:  http://evansville.enviroflash.info/.

Metropolitan Evansville Transportation System (METS):  www.evansville.in.gov/Index.aspx?page=765.


For more information about air quality issues, click on the Air Quality / Alert sections in the menu to the left.

Click here for the City / County Employee Guide to Air Pollution Alerts

Click here for a Citizen's Guide to Air Pollution Alerts

Sign-up for daily air quality forecasts and air quality alert notices at:




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Last updated: 8/18/2017 11:10:02 AM