More than 137 million Americans live in communities with unhealthy levels of air pollution.
Air pollution consists of harmful or poisonous substances in outdoor or indoor air. Air pollution is harmful to people even if they do not have lung disease, but it is particularly dangerous for people living with asthma, COPD, and other respiratory ailments.
Despite progress in recent years, air pollution continues to be a serious environmental and health problem. The Chicago metropolitan region continues to violate federal air quality standards for harmful ozone and still faces threats from particulate matter pollution. The U.S. Environmental Protection Agency also ranks poor indoor air quality among the top five environmental risks to public health.