Air quality laws<section begin=overview /> govern the emission of
air pollutants into the
atmosphere. A specialized subset of air quality laws regulate
the quality of air inside buildings. Air quality laws are often designed specifically to protect human health by limiting or eliminating airborne pollutant concentrations. Other initiatives are designed to address broader ecological problems, such as limitations on chemicals that affect the
ozone layer, and
emissions trading programs to address
acid rain or
climate change. Regulatory efforts include identifying and categorizing air pollutants, setting limits on acceptable emissions levels, and dictating necessary or appropriate mitigation technologies.<section end=overview />