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An air quality health advisory is in effect on Long Island for the third consecutive day as elevated levels of ground-level ozone will make air unhealthy to breathe, according to state environmental and health officials.

The advisory is in effect from 10 a.m. until 11 p.m.

The DEC and the state health department issue air quality health advisories when air pollution from either ozone or fine particulate matter exceed an air quality index of 100.

The air quality index for ozone will reach 151 today on Long Island, according to the air quality forecast by the the State Department of Environmental Conservation.

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, according to state officials. An AQI of 0 to 50 is “good,” from 51 to 100 is “moderate,” from 101 to 150 “unhealthy for sensitive groups,” from 151 to 200 “unhealthy,” from 201 to 300 “very unhealthy” and from 301 to 500 “hazardous.”

Summer heat can lead to the formation of ground-level ozone, a major component of photochemical smog, the DEC says. Automobile exhaust and out-of-state emission sources are the primary sources of ground-level ozone and are the most serious air pollution problems in the northeast.

People, especially young children, those who exercise outdoors, those involved in vigorous outdoor work and those who have respiratory disease (such as asthma) should consider limiting strenuous outdoor physical activity when ozone levels are the highest (generally afternoon to early evening).

Individuals experiencing symptoms such as shortness of breath, chest pain or coughing should consider consulting their doctor.

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Denise is a veteran local reporter, editor, attorney and former Riverhead Town councilwoman. Her work has been recognized with numerous awards, including investigative reporting and writer of the year awards from the N.Y. Press Association. She is a founder, owner and co-publisher of this website.Email Denise.