The American Lung Association’s new “State of the Air” report reveals that spikes in deadly particle pollution are the most severe they’ve been in the history of the report. According to the new report, people in the U.S. experienced the most days with “very unhealthy” and “hazardous” air quality due to particle pollution in 25 years. In total, the report finds that 131 million people (39%) are living in areas with unhealthy levels of air pollution.