“A new body of emerging research shows that people are dying prematurely from breathing the air even in places where air pollution levels were deemed “safe” by the US.”

“We found that the mortality rate increases almost linearly as air pollution increases,” Francesca Dominici, professor of biostatistics at Harvard’s school of public health, and a senior author on the paper, said in a statement.

Though the study focuses on the US, its basic conclusion applies broadly: the “safe” levels laid out by national health agencies everywhere are inherently far from safe. “Any level of air pollution, no matter how low, is harmful to human health,” Dominici said.

Read more here