Air Quality Forecasts

Like the weather, air quality conditions can be forecast. The APCD works with the Indiana Department of Environmental Management (IDEM) to forecast ozone and fine particle (PM2.5) pollution levels using meteorological expertise and computer models. Monitoring data, collected locally, and meteorological data are used to generate the forecast.

For Ozone

  • Forecast peak 8-hour average concentrations for one to three days ahead.
  • Concentrations are forecast from March through October.

For PM2.5

  • Forecast peak 24-hour average concentrations for a three- or four-day period.
  • Concentrations are forecast year-round.

Forecasts are reported in Air Quality Index (AQI) values. The APCD issues an Air Quality Alert when air pollution is forecast to reach unhealthy levels (AQI value higher than 101). Alerts may be used to:

  • Help citizens avoid air pollution related health impacts; and
  • Encourage businesses and individuals to take action to reduce polluting activities.

You can learn more about the health impacts of air pollution and actions you can take to reduce air pollution at the Kentuckiana Air Education (KAIRE) website

Louisville Air Watch

The APCD provides current local air quality information at the website Louisville Air Watch. You can find the current AQI as well as information on specific air pollutants at the various air monitoring stations in and around Louisville. 


The APCD also participates in the EPA's AirNow website to provide the public with easy access to national air quality information. AirNow offers daily AQI forecasts as well as real-time AQI conditions for more than 300 cities across the U.S. To provide “real-time” AQI conditions, AirNow displays data as soon as practical after the end of each hour. Although some preliminary quality assessments are performed, the data is not fully verified or quality assured and is intended to be used in reporting and forecasting the AQI only.


EnviroFlash is a system that sends text messages and e-mails about the daily air quality forecast as well as updates on current conditions. The message is the same air quality information that the local media provide, along with suggested safety measures when levels are unhealthy. This service is provided by the APCD and the EPA.

With EnviroFlash you can:

  • Receive Air Quality Alerts wherever you are, at home, at work, or on the go; and
  • Choose to receive air quality forecasts and at what level to be notified.

EnviroFlash is especially helpful for people who are more sensitive to the effects of air pollution, such as the young, people with asthma, and the elderly. Sign up for EnviroFlash Today!

Enter your address and MyLouisville will find nearby city services in the following categories:

  • Garbage Icon Solid Waste Services
  • Police Badge Icon Emergency Services
  • Political Info Icon Political Info
  • House Icon General Location Info

Find your garbage, recycling, yard waste and large-item set-out dates. Sign up for large-item set out and street sweeping reminders by email and text!

The new Metro311 Reporting System and our new 311 mobile app is live!

Report Something to Us!

Call MetroCall at 311 or (502) 574-5000

No service has been selected.

No form has been selected.