SAN FRANCISCO (KRON)—The Bay Area Air Quality District announced a Spare the Air Alert for Wednesday.

This is the nineteenth issued in 2016.

Light winds and hot temperatures are predicted for that particular day.

These weather conditions combined with car exhaust will cause air quality to reach unhealthy levels in the Bay Area.

“Exhaust from the millions of cars on Bay Area roads will cause unhealthy air quality on Wednesday,” said Jack Broadbent, executive officer of the Air District. “Even a short heat wave reminds us that we need to make necessary changes to our commute to reduce pollution every day like carpooling, biking and walking.”

The air district recommends for people to bike, walk, carpool or take public transit to work.