The influence of nitrogen dioxide, NO2, and ozone, O-3, on sulfur dioxide-, SO2-, induced atmospheric corrosion of nickel has been investigated through combined laboratory and field exposures. Both types of exposures result in corrosion products with nickel(II) sulfate as the main constituent. NO2 accelerates SO2-induced corrosion significantly more than O-3 and the results suggest that a mixture of SO2 and NO2 in proper concentrations can simulate the atmospheric corrosion behavior of nickel in a broad range of environments.