(Berkeley Lovelace Jr./ NBC News) — Air quality advisories were in effect for 110 million people in the United States on Wednesday morning, ranging from New Hampshire to South Carolina and covering the Northeast, including Boston, New York City and Philadelphia.

In the Northeast, the poor air quality is the result of wildfires  …

(Isabelle Gallant/ BC News) — Asthma may be one of the most common chronic diseases in Canada, but experts say it can be tough to diagnose.

“The best way to make a diagnosis of asthma is to have a patient do breathing tests,” Dr. Shawn Aaron, a respirologist at the Ottawa Hospital, told Dr. Brian Goldman, host of  …

(Damian Carrington/ The Guardian) — Infants whose mothers were exposed to higher levels of tiny air pollution particles during pregnancy are much more likely to develop asthma, according to research.

The study analysed the impact of ultra-fine particles (UFPs), which are not regulated by governments. These are thought  …