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Air Pollution Air pollutants such as carbonmonoxide (CO), hydrogen sulfide (H2S), nitrogen oxides (NOx), particulate matter (PM), and volatile organic compounds (VOCs) are released from various stages of shale gas development. NOx and VOCs mix in the presence of sunlight to form groundlevelozone (smog).
When Congress passed the Clean Air Act in 1970, they determined that six so-called “ criteria air pollutants ”—particulate matter, ground-levelozone, carbonmonoxide, lead, sulfur dioxide, and nitrogen dioxide—were so dangerous they required a rigorous and regularly updated process of assessment and policymaking.
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