The Indiana Department of Environmental Management is forecasting high ozone levels Tuesday for four regions in the central, southern and western parts of the state.
The alert covers Daviess, Dubois, Gibson, Greene, Knox, Perry, Pike, Posey, Spencer, Vanderburgh and Warrick counties in southwestern Indiana.
Also included are Clark and Floyd counties in southeastern Indiana; Vigo, Carroll and Tippecanoe counties in west central Indiana; and Marion, Bartholomew, Boone, Brown, Delaware, Hamilton, Hendricks, Howard, Madison and Shelby counties in central Indiana.
Anyone sensitive to changes in air quality may be affected when ozone levels are high.
Children, the elderly, and anyone with heart or lung conditions should reduce or avoid exertion and heavy work outdoors.