From the Ohio Environmental Protection Agency:
The first four months of air quality data collected near a shale gas drilling well shows the air remains clean.
Ohio EPA started collecting data at a gas-drilling site located near The Wilds in Muskingum County in April 2012.
The monitor measures particulate matter (PM) pollution, along with various hydrocarbons associated with gas drilling and methane.
The results of the air monitoring revealed no violations of the federal PM2.5 standards, although concentrations of PM10 exceeded the federal threshold of 150 micrograms per cubic meter on June 8, 2012.
The single exceedance may have been caused by construction of a nearby road that occurred at that time.
Ohio EPA will continue to add more monitoring equipment and monitor air quality at well sites for at least two years.
Chesapeake Energy Corp,the Oklahoma-based firm is the No. 1 driller in Ohio.
Rig Count Interactive Map by Baker Hughes, an energy services company.
Shale Sheet Fracking, a Youngstown Vindicator blog.
The Ohio Environmental Council, a statewide eco-group based in Columbus.
Earthjustice, a national eco-group.
People's Oil and Gas Collaborative-Ohio, a grass-roots group in Northeast Ohio.
Concerned Citizens of Medina County, a grass-roots group.
No Frack Ohio, a Columbus-based grass-roots group.
Fracking: Gas Drilling's Environmental Threat by ProPublica, an online journalism site.
Pipeline, blog from Pittsburgh Post-Gazette on Marcellus shale drilling.
Allegheny Front, environmental public radio for Western Pennsylvania.