The wildfire smoke that blanketed Pittsburgh in July has cleared. But the health threat it exposed remains.
Smoke from Canadian wildfires pushed Allegheny County’s air quality into the maroon range July 16, meaning the pollution posed a hazard to everyone rather than only children, older adults and people with certain health conditions. County officials urged residents to limit their time outdoors.
For people with asthma and other respiratory conditions, the microscopic particles in wildfire smoke can trigger attacks, worsen breathing and lead to emergency care…