In New York City there are fifty-one different types of mosquitoes. Most mosquitoes do not transmit disease and some do not bite humans at all. Some mosquitoes have the ability to spread diseases like West Nile virus. From April 1 through October 31, the city monitors mosquito populations and conducts activities to reduce the number of mosquitoes.

To reduce the number of mosquitoes in the city it is important to remove standing water. In residential areas, standing water can accumulate in unused tires, cans, clogged gutters, unused pools and pool covers and other receptacles that collect water.