An air quality health advisory will be in effect again tomorrow for the Long Island region from 11 a.m. to 11 p.m.

Air quality will be “unhealthy for sensitive groups,” including the elderly, young children and people with respiratory disease (such as asthma), who should consider limiting strenuous outdoor activities, according to the advisory.

The pollutant of concern is ground-level ozone, according to the advisory issued by the state commissioners of environmental conservation and health.

Air quality health advisories are issued when DEC meteorologists predict levels of pollution, either ozone or fine particulate matter, are expected to exceed an air quality index (AQI) value of 100. The AQI was created as an easy way to correlate levels of different pollutants to one scale, with a higher AQI value indicating a greater health concern.  The AQI for Long Island tomorrow is forecast to reach 108.

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