You should read the OP > Researchers say that laws intended to combat air pollution don’t address increasingly important sources, such as wildfires and dust. I

You should read the OP > Researchers say that laws intended to combat air pollution don’t address increasingly important sources, such as wildfires and dust. In fact, the EPA created an exemption for the increased air pollution that occurs during wildfires, dust storms and similar events considered to be ‘natural’. The agency’s ‘exceptional events rule’, adopted in 2007, excludes days when such events happen from consideration by regulators. > By pruning outliers deemed ‘natural exceptions’, the regulatory data set is skewed, says Katie Clifford, author of a paper this year that called the practice into question.