The Bay Area Air District has issued a Spare the Air alert for Wednesday because of a forecast of unhealthy air quality due to high temperatures and light winds in the region.

The air district said the weather conditions are expected to contribute to elevated levels of ozone, otherwise known as smog, particularly in the East Bay and South Bay.

Ozone can cause health problems, particularly in children, older people and those with respiratory or heart conditions, according to the air district, which advises people to only exercise outdoors in the early morning hours on Spare the Air days.

The National Weather Service has issued a Heat Advisory for Wednesday and Thursday in the Bay Area because of temperatures that could reach 105 degrees in some inland locations. The advisory will be in effect from 10 a.m. Wednesday through 10 p.m. Thursday.

Dan McMenamin is the managing editor at Bay City News, directing daily news coverage of the 12-county greater Bay Area. He has worked for BCN since 2008 and has been managing editor since 2014 after previously serving as BCN’s San Francisco bureau reporter. A UC Davis graduate, he came to BCN after working for a newspaper and nonprofit in the Davis area. He handles staffing, including coaching of our interns, day-to-day coverage decisions and management of the newswire.