The Maine Department of Environmental Protection has issued a warning of unhealthy air quality on Wednesday, which could affect those with sensitive respiratory systems.

“Children, the elderly and individuals suffering from respiratory or heart diseases such as asthma, bronchitis or COPD can experience reduced lung function and irritation,” DEP said in a statement. “In addition, healthy adults who exert themselves outdoors may also notice these health effects.”

Ozone levels will be unusually high Wednesday in coastal areas as far south as Kittery and as far north as Acadia National Park. Moderate levels are expected for coastal Downeast regions and interior parts of western Maine.

Particle pollution, the DEP warned, was expected to reach “moderate” levels statewide Wednesday as well.

High ozone levels especially prompted the state to describe air quality as “unhealthy for sensitive groups” in the affected areas.

“Affected individuals may notice symptoms such as coughing, shortness of breath, throat irritation and/or experience mild chest pain,” DEP stated.

DEP suggested those who might be sensitive to the air quality to avoid strenuous activity and when indoors keep windows closed and circulate indoor air with fans or air conditioners.

For those with asthma, DEP recommended keeping medication or action plans nearby.

DEP meteorologists predict that a front moving into the state on Thursday will lower ozone levels out of the unhealthy range. Particle pollution, DEP wrote, is also expected to drop.

DEP recommended anyone looking for more information on air quality forecasts visit DEP’s website. Mainers can also call DEP’s air quality hotline at 1-800-223-1196.