SAN FRANCISCO -- The Bay Area Air Quality Management District issued its fourth Spare the Air Alert of the year for Saturday.

The district stated that due to poor air quality because of high temperatures expected this weekend, coupled with low winds, vehicle exhaust is expected to cause unhealthy ozone accumulation in the Bay Area.

"The hot weather forecast for the Bay Area over the next several days is expected to cause unhealthy air quality so it's critical that we all find ways to reduce air pollution by driving less," district Executive Officer Jack Broadbent said in a release. "Taking transit, carpooling, biking and walking are great alternatives to driving alone and help keep smog-forming pollution from impacting our air."

However, with a BART strike looming Monday, commuters and travelers could find it difficult to get around without the use of their vehicles.

The district also said tomorrow that there is no free transit scheduled and there is no wood burning ban in place.

For more information, visit www.sparetheair.org or call 1-800-HELP-AIR.

Contact Katie Nelson at 925-945-4782 or follow her at Twitter.com/katienelson210.