@electronic{www.epa.gov,
   title       = {Air | Citizen Science | Region 2 | US EPA}, 
   url         = {http://www.epa.gov/citizenscience/air.html},
   biburl      = {https://puma.uni-kassel.de/url/7d86f1f9867a4891d2924cc0a9a667a9/stumme},
   keywords    = {air airprobe citizen epa everyaware pollution science sitc},
   added-at    = {2015-02-02T11:45:10.000+0100},
   description = {},
   interhash   = {7d86f1f9867a4891d2924cc0a9a667a9}, 
   intrahash   = {7d86f1f9867a4891d2924cc0a9a667a9}
}