Drive only when necessary. Driving less reduces the amount of pollution your automobile generates. Automobiles emit tremendous amounts of airborne pollutants, which increase acid rain; they also deposit toxic metals and petroleum byproducts into the environment. Regular tune-ups and inspections can help keep automotive waste and byproducts from contaminating runoff. Clean up any spilled automobile fluids.

 

The above tips are from:  
 

http://www.leoncountyfl.gov/pubworks/Engineering/Stormwater_ Management/WaterQualityIssues.asp   http://www.leoncountyfl.gov/pubworks/Engineering/Stormwater_ Management/WQ_Fact_Month.asp