Suffolk County is planning both aerial and ground spraying Tuesday, weather permitting, as part of its ongoing mosquito control effort, health officials said Monday.

From 5 a.m. to 8 p.m., area salt marshes are to be sprayed by helicopter at a low level, targeting larvae and using the pesticides Vectobac 12AS and Altosid liquid concentrate. County officials said residents don't need to take precautions, because any human exposure is unlikely and the pesticide has "no significant human toxicity."

Spraying is to be conducted in areas of the towns of Islip, Brookhaven, Southampton, East Hampton, Riverhead and Southold.

Also, ground spraying targeting adult mosquitoes is to be conducted from 6 to 10 p.m. on streets in the Fire Island villages of Davis Park and Point O'Woods with the pesticide Anvil, officials said.

Areas of Bellport, Brookhaven hamlet and North Shirley are to be sprayed from 7:30 to 11:30 p.m. with the pesticide Scourge.

Besides being annoying, some mosquitoes' bites can transmit West Nile virus to people.

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The chances of experiencing health effects from the ground spraying are "quite low," the health department said, but children and pregnant women should avoid exposure if possible by staying clear of the area during spraying and at least 30 minutes after.

Among the "common-sense steps" the department suggests are closing doors, windows and air-conditioning vents during spraying and 30 minutes after.

For details, call Suffolk's spraying information hotline at 631-852-4939 or visit http://nwsdy.li/sprayings.