An air quality health advisory has been issued until 11 tonight for an area that includes Genesee, Orleans and Wyoming Counties.

The state Department of Environmental Conservation and state Department of Health issued the advisory for Western New York and Eastern Lake Ontario due to high levels of ozone.

The advisory also includes Monroe, Erie, Niagara, Chautauqua, Cattaraugus, Wayne, northern Cayuga, Oswego, and Jefferson counties. Separate advisories are in effect for areas in Long Island and metro New York City.

There are no advisories for Livingston County.

It will be quite warm today, though not especially humid, with high temperatures reaching the lower 90s across the lake plains, mainly east of Batavia. Elsewhere temperatures will peak in the mid- to upper-80s, the National Weather Service said in a forecast discussion this morning.

More humid air will move into the region on Monday. This will fuel some showers and thunderstorms, primarily in the vicinty of a lake breeze boundary over the Southern Tier and Finger Lakes during the afternoon. Lake shadowing should maintain fair dry weather in a corridor from Lake Erie and the Niagara Frontier to Rochester over to the North Country. High temps will be similar to those from today, but notably higher humidity levels will support apparent temps in the low to mid 90s, the Weather Service said.

The high temperatures, combined with high humidity could lead to heat advisories being issued.

Normal temperatures for this time of year average 75 degrees. A year ago, temperatures reached 85 degrees in Rochester and 77 degrees in Buffalo. Today’s record high is 94 in Rochester and 87 in Buffalo, according to historical data from the National Weather Service.

Residents connected to the public water supply system in Genesee County are being reminded to conserve water.

The reminder was issued by officials from the county, the city and town of Batavia, village of Oakfield, village of Elba, and the Genesee County Department of Health.

The call to conserve takes on even greater importance with unseasonably hot weather forecast for the next several days, including over this weekend and into next week, municipalities said.

The state Department of Environmental Conservation and state Department of Health issue air quality health advisories when DEC meteorologists predict levels of pollution, either ozone or fine particulate matter are expected to exceed an Air Quality Index 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.

Summer heat can lead to the formation of ground-level ozone, a major component of photochemical smog. 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. This surface pollutant should not be confused with the protective layer of ozone in the upper atmosphere.

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).

When outdoor levels of ozone are elevated, going indoors will usually reduce your exposure. Individuals experiencing symptoms such as shortness of breath, chest pain or coughing should consider consulting their doctor.

Ozone levels generally decrease at night and can be minimized during daylight hours by curtailment of automobile travel and the use of public transportation where available.

New Yorkers also are urged to take the following energy-saving and pollution-reducing steps:

■ use mass transit or carpool instead of driving, as automobile emissions account for about 60 percent of pollution in our cities;

■ conserve fuel and reduce exhaust emissions by combining necessary motor vehicle trips;

■ turn off all lights and electrical appliances in unoccupied areas;

■ use fans to circulate air. If air conditioning is necessary, set thermostats at 78 degrees;

■ close the blinds and shades to limit heat build-up and to preserve cooled air;

■ limit use of household appliances. If necessary, run the appliances at off-peak (after 7 p.m.) hours. These would include dishwashers, dryers, pool pumps and water heaters;

■ set refrigerators and freezers at more efficient temperatures;

■ purchase and install energy efficient lighting and appliances with the Energy Star label; and

■ reduce or eliminate outdoor burning and attempt to minimize indoor sources of PM 2.5 such as smoking. A toll-free Air Quality Hotline (1-800-535-1345) has been established by DEC to keep New Yorkers informed of the latest Air Quality situation.

Additional information on ozone is available at on DOH’s website.

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