Canadian forest fires are responsible for that haze that southwestern Pennsylvania has been dealing with the past few days.
With the heavy smoke blowing into the region, the Pennsylvania Department of Environmental Protection has issued a Code Red Air Quality Action Day for the entire commonwealth.
That means everyone, not just the elderly, young kids and those with breathing problems should limit outdoor activities.
Those sensitive groups should take extra precaution.
Windows should be closed inside your home and wearing a mask is recommended.
"For today, northerly winds will bring more waves of wildfire smoke into the region," The Allegheny County Health Department said in a release. "Canada’s wildfires are being fueled by dry conditions with breezy winds, which will increase the chances of periods of elevated concentrations of PM2.5. Similar conditions may continue Thursday, as the northerly flow of wind is expected to keep the smoke from the fires in the direction of Allegheny County."
The poor air quality isn’t only affecting the Pittsburgh area.
Tens of millions of people across over 10 states are dealing with poor air quality due to the over 150 wildfires in the Quebec Province and 420 fires across the entire country.
The Health Department says companies that produce fine particulate matter, which contains hundreds of different chemicals are required to reduce particulate emissions.
"Residents can aid in the reduction of PM2.5 in the area by reducing or eliminating fireplace and wood stove use, avoiding the open burning of leaves, trash, and other materials, and avoiding the use of gas-powered lawn and garden equipment," the county added.
Poor air quality could affect the area through Friday.
Visit the County’s Air Quality website for the latest readings.