90-degree temperatures prompt ozone action day in Ann Arbor

The alerts are issued when ground-level ozone and fine particle pollution exceed levels considered healthy. Generally, high temperatures and humidity lead to these conditions. These levels Sunday are expected to be unhealthy for sensitive people.

The department urges people, especially those with respiratory conditions such as asthma, to avoid prolonged outdoor exertion.

People and businesses are also urged to avoid activities that lead to ozone formation. These activities include: refueling vehicles, using gasoline powered lawn equipment and using charcoal lighter fluid.

The forecast calls for mostly sunny conditions and highs near 90 degrees Saturday and Sunday.

Besides Washtenaw County, other counties included in the ozone action day advisory are Genesee, Lapeer, Lenawee, Livingston, Macomb, Monroe, Oakland, Shiawassee, St. Clair and Wayne.

This is the second ozone action day declared this year in the Ann Arbor area. The first was on May 24.

For updated forecasts and weather conditions any time, check AnnArbor.com's weather page.