Ground-level ozone concentrations are expected to reach the “Unhealthy for Sensitive Groups (USG) level for Tuesday, May 19, 2026, according to the Maine Department of Environmental Protection according to a press release issued late yesterday afternoon.

The entire coastline of Maine is expected dto rech the USG level on Tuesday for ozone.  MOderate levels of ozone are expected for the eastern and western interior as well as the western mountains region.  Meanwhile, most of Maine except the northern region is expected to be moderate for particle pollution.

Areas in southern New England recorded high ozone levels on Sunday and Monday.  The air mass is expected to reach Maine on Tuesday.

At elevated ozone levels, children, older adults, those who work outdoors and individuals suffering from respiratory or hear diseases such as asthmaa, bronchitis, or COPD can experience reduced lung function and irritation.  In addition, healthy adults who exert themselves outdoors may also notice these health effects.  Affected  individuals may notice symptoms such as coughing, shortness of breath, throat irritation, and/or experience mild chest pain.

Some actions you can take to protect your health during such periods include:  Avoid strenuous outdoor activity; Close windows and circulate indoor air with a fan or air conditioner; and If you have asthma, keep your quick-relief medications and action plan handy.