Air quality issues have been attributed to natural gas drilling in other parts of the country. Drilling in Wyoming, in particular, has led to the release of ground level ozone (O3), causing smog that was worse than the levels recorded in Los Angeles. Air quality issues in the Barnett Shale drilling area in Texas have also been at the forefront of environmental concerns. Guidelines and regulations for drillers aimed at reducing the amount of pollutants released into the air as a result of
hydraulic fracturing are being developed by the Environmental Protection Agency (EPA). Separate mitigation measures are included in the revised draft Supplemental Generic Environmental Impact Statement (SGEIS) developed by the New York Department of Environmental Conservation (NY DEC).