Amy Wainwright of the Northeast Ohio Areawide Coordinating Agency says pollution advisories are more common in the summer because of ground level ozone, which forms in hot temperatures. But fine particulates from gas vehicles and smokestacks can become elevated in any temperature, and today the conditions were right.
"If you have moisture in the air you tend to get high fine particulate matter pollution. If there's no wind to blow it away, then you end up with an air quality advisory and that's what we're looking at today."
That pollution should blow out early tomorrow as a northern clipper system moves through. Last year there were only two winter pollution advisory days - both in February.
