The Run for Clean Air is Philadelphia's largest Earth Day celebration and Clean Air Council's largest fundraising event. The race brings out thousands of runners, walkers, and spectators and dozens of local and national sponsors to celebrate Earth Day on April 22nd. The event includes a 10K Run, 5K Run, 3K Walk, and Kids' Fun Run! All proceeds go to Clean Air Council to help fund its work on air quality issues throughout Pennsylvania, New Jersey, and Delaware. Online registration can be found here.