Changes in atmospheric concentrations of gases including CH₄, O₃, NO₂, SO₂ are one of the most current issues, due to the observed global warming. The concentration of atmospheric gases is being monitored by satellite measurements and also by tropospheric air monitoring stations located at various geographical latitudes. Polish law and EU Directives determine the limit values of concentrations of air pollutants established for the protection of human health: sulphur dioxide, nitrogen dioxide, benzene, carbon monoxide, ozone, PM10, lead, arsenic, cadmium, nickel and benzo(a)pyrene. The basic equipment of monitoring stations does not include methane analysers. Our monitoring station is one of two stations in Poland with a CH₄ analyser. The sampling intake of the KUL monitoring station is located on the wall oriented perpendicularly to the Lublin-Krakow road, c.a. 41.5 m from this very frequently used road. The research, conducted for three years beginning from 2007 until 2009, showed significant variations in greenhouse gases (GHG) concentrations. The increase in mean annual methane concentration noted at the KUL station was 1.4 % for the years 2007-2008 and 1.7% for 2008-2009. The growth rate of ozone mixing ratio was 29% in the period of 2007-2009. Annual mean values of NO₂ concentration in 2007 were 50.3% higher than in 2009. The growth rate of SO₂ mixing ratio exceeded 65% between 2007 and 2008. The concentration levels of pollutants in the air were related directly with the emission of pollutants to the atmosphere and with the meteorological conditions.