The New York Times writer, Nadja Popovich, reports that after nearly a decade of improving the air quality nationally, the US EPA's data shows that PM 2.5 has increased in the past two years. This 180 turn of progress has been identified as likely primarily coming from increases in driving and the burning of natural gas. However, in the West, wildfires has been a large cause of the increase as well. Researchers suggest that due to a decrease of enforcement of the Clean Air Act, less businesses are concerned with their pollution.