I find it unusual to have pollution alerts this time of year. In SW Ohio we are accustomed to these types of alerts in the heat of July and August, but in Winter it's unusual. This would indicate that the atmosphere isn't moving - that the fine particulates and pollution is "trapped".

It's been announced on the Weather Channel over the past 3 days, but there are no articles or detailed information that I can find on a search engine.

Peace - Anna