From the Clean Air Council (http://www.cleanair.org/):
The 31st Annual 5K Run for Clean Air and Earth Day Celebration (http://www.5krunforcleanair.org/) will take place April 21st, 2012. The course starts at the Philadelphia Art Museum and runs along Martin Luther King Drive. The 5K Run for Clean Air is a region-wide celebration of efforts to decrease the air pollution that triggers asthma and other respiratory problems in our families, to support programs that reduce waste in favor of increased recycling and composting, and to promote policies that slow down global warming.
3K Walk Event New for 2012
New to the event for 2012, a 3K walk has been added so that EVERYONE can come out and participate. The walk will start at 9:30 a.m., 30 minutes after the 5K run goes off, so bring friends and family so that everyone can take part in the region’s LARGEST Earth Day celebration!
Register Now and Save at http://www.active.com/running/philadelphia-pa/5k-run-for-clean-air-2012!