PORTLAND — Maine environmental officials have issued an air quality alert for the southern coast.

The Department of Environmental Protection says the alert will be in effect from late Friday morning through the evening for coastal York, Cumberland and Sagadahoc counties.

The DEP says ground ozone concentrations are expected to reach unhealthy levels.

Officials say people in those areas should limit strenuous outdoor activity and take plenty of breaks. The problems can be more acute for those already suffering respiratory disease like asthma.

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