Air quality in southeastern Pennsylvania will be moderate over the next 2 days

AirNow.gov shows a moderate air quality warning for southeastern Pennsylvania. (Courtesy of AirNow.gov)

Airnow.gov is reporting a moderate air quality warning for southeastern Pennsylvania that is expected to last through Thursday. The yellow warning covers all counties in the eastern part of the state west toward Harrisburg.

As of 10 a.m. Wednesday, the air quality index from Allentown to Philadelphia, including Reading, Lansdale, Media, Norristown, Pottstown and West Chester, was 62. An index between 50 and 100 is considered moderate, according to the Pennsylvania Department of Environmental Protection.

A yellow air quality index means the air is acceptable but may pose a risk to some people, particularly those who are unusually sensitive to air pollution, warns AirNow.

On Wednesday, fine dust particles will be the main cause and rising ozone levels are expected for Thursday.

Airnow.gov is a partnership between the U.S. Environmental Protection Agency, National Oceanic and Atmospheric Administration (NOAA), National Park Service, NASA, Centers for Disease Control, and tribal, state, and local air quality agencies.