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.

‘Dramatic’ rise in wildfire smoke triggers decline in US air quality for millions comes via ChinaTechNews.com.