Drone footage examines some of the key sources of coarse and fine particulate pollution in Central California, which has some of the worst such pollution in the United States.
Coyhaique sees annual average PM2.5 concentrations of about 64 micrograms per cubic meter, well above global standards considered safe. At certain times of the year, levels can double, or even triple. And like the nation’s capital, Santiago, which also sees dangerous levels of air pollution, geography is part of its fate.
