Due to wildfires 40% of Americans live in places with unhealthy levels of air pollution. The western states are the most severely affected. Number of extreme wildfires on earth has doubled in last 20 years with catastrophic health effects. Climate change is exacerbating fire weather and extreme blazes. The 6 most dangerous years in history have been since 2017. In US the damage has undone all the entire progress of Clean Air act enacted in 1970.
