‘Dramatic’ rise in wildfire smoke triggers decline in US air quality for millions

Recent record fire seasons in the west have increased pollution across the country, affecting people's health, scientists say

Millions of Americans are now routinely exposed to unhealthy plumes of wildfire smoke that can waft thousands of miles across the country, scientists have warned.

Wildfires cause soot and ash to be thrown off into the air, which then carries the minuscule particles that can be inhaled by people many miles away, aggravating a variety of health conditions. The number of people in the US exposed to unhealthy levels of these particulates from wildfires at least one day a year has increased 27-fold over the last decade, a new study found, with 25 million people in 2020 alone breathing in potentially toxic air from fires.