 Most mosquito control spray equipment is noisy and will travel 10 to 15 miles per hour while spraying. Grand Forks, they do have a couple of electric sprayers that are relatively quiet. The mosquito control trucks are identified and travel with flashing yellow lights. To ensure spray effectiveness during the spray operation, winds should be 10 miles per hour or less and no inclement weather present. Winds higher than 10 miles per hour and inclement weather may result in the spraying being suspended until conditions improve.