Ground-level ozone concentrations are expected to reach the “Unhealthy for Sensitive Groups” level on Wednesday, according to the Maine Department of Environmental Protection.
Ozone values in the rest of New England have been high for days. Ozone moved further into Maine overnight than expected. As yesterday’s ozone plume moves on during the morning hours, ozone values are expected to decrease; however, more ozone is expected to move in and form over the Gulf of Maine today. The entire coast, as well as both the Western and Eastern Interior regions, are now likely to reach the “Unhealthy for Sensitive Groups” category. These areas include all of York, Cumberland, Sagadahoc, Lincoln, Androscoggin, Kennebec, Knox, Waldo, Hancock, and Washington counties and the southern half of Penobscot County.