The temporal variations of the aerosol-producing gases in the near-ground layer of the atmosphere were investigated. Measurements of the variations of nitrogen oxide concentrations were carried out using a P310.2 chemiluminescent gas analyzer. The daily mean variations of nitrogen oxide concentrations were calculated for the periods June-July, September-October and November-December 1998. The most strong variations were observed from June 15-20 to July 10-14, 1998.