Ground-level ozone concentrations will be climbing in Maine on Thursday, Aug. 11, and are expected to reach unhealthy levels, according to the Maine Department of Environmental Protection. Unhealthy levels are expected along the coast from Kittery through Acadia National Park. Moderate levels of ozone are possible in the Downeast Coast as well as the Western Interior region. In addition, moderate levels of particle pollution are likely for the Portland area.

The weather will also be extremely hot and humid Thursday, so sensitive people — including older adults, infants, those with chronic diseases,such as asthma or COPD, and those who work outside — should be especially cautious. Stay cool, in an air conditioned space if possible; lie low and drink plenty of fluids.