August 25, 2020

City to Spray Insecticide Thursday to Kill Mosquitoes

Targeted Efforts Protect Edison Park Residents from West Nile Virus

Elena Ivanova

CHICAGO - The Chicago Department of Public Health (CDPH) is continuing its efforts to protect residents against West Nile virus. Based on results from its citywide mosquito surveillance program, CDPH has determined the need to spray to kill adult mosquitoes in Edison Park this Thursday, August 27, 2020.

Weather permitting, the spraying will begin at dusk on August 27th and continue through the night until approximately 1:00 am, with licensed mosquito abatement technicians in trucks dispensing an ultra-low-volume spray. To download a map of the spray zone, click here.

*For photographers and camera crews interested in b-roll and photo of spraying, the staging area for the spraying will occur at 6453 W. Higgins St., Chicago, at 8:00 pm, with spraying beginning at dusk.*

In addition to spraying, each year CDPH conducts a comprehensive mosquito surveillance program, which includes placing larvacide in catch basins to limit the number of mosquitoes that can carry the virus, and trapping mosquitoes throughout the city and testing them for West Nile virus. By using data, the city is able to most efficiently target high-risk areas for the virus and keep residents safe.

The material being used to control the adult mosquitoes, Zenivex™, is approved for use by the U.S. Environmental Protection Agency and has been widely applied to control mosquitoes in outdoor residential and recreational areas. The spray will be applied by licensed mosquito abatement technicians from Vector Disease Control International, a leader in the mosquito control industry. Guiding the crews through the streets will be supervisors from the Chicago Department of Streets and Sanitation.

The spray is not harmful to people or pets and is routinely sprayed in residential areas across the nation. If residents are concerned about the spraying they can choose to stay indoors and close their windows while it is underway. CDPH staff has been leaving door hangers in the affected areas to notify residents that the spraying will occur.

As part of ongoing response efforts, CDPH will continue to collect mosquitoes from traps located throughout the city and test these mosquitoes for West Nile virus. CDPH will determine the appropriate steps to best protect Chicago residents based on these results. CDPH reminds residents that the most effective way to prevent West Nile virus is to prevent mosquito bites.

  • Use insect repellent that contains DEET, Picaridin, IR3535, or Oil of Lemon Eucalyptus.
  • Eliminate standing water. This includes emptying water from flowerpots, gutters, pool covers, pet water dishes and birdbaths regularly.
  • Keep grass and weeds short to eliminate hiding places for adult mosquitoes.
  • When outside between dusk and dawn, wear loose-fitting, light colored clothing including long pants, long sleeve shirts, socks and shoes.
  • Check that all screens, windows and doors are tight-fitting and free of holes and tears.
  • Check on neighbors regularly who may need additional assistance, including the elderly.

In 2020, CDPH previously sprayed in the following neighborhoods:

  • South Lawndale (8/13)
  • Brighton Park (8/13)
  • Archer Heights (8/13)

West Nile virus cannot be transmitted from person-to-person. Instead, it is transmitted strictly through mosquitoes. Most mosquitoes do not carry the virus. Additional information on the virus, including symptoms and how to protect against the virus can be found at


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