Get periodic tune-ups, maintain sharp mower blades , and keep the underside of the deck clean. Take time to winterize equipment each fall. Consider cleaner options. Ask your dealer about the new, cleaner gasoline equipment entering the marketplace. Propane and solar options are also available for some types of equipment.
Electric equipment is cleaner than equipment powered by gasoline engines.
Electrically-powered lawn and garden tools produce essentially no pollution from exhaust emissions or through fuel evaporation. However, generating the power to run electric equipment does produce pollution. Use manual tools. Tools that don't require electric or gasoline engines are especially handy for small yards or small jobs. Reduce mowing time.