Due to the rapid development of the Kingdom of Saudi Arabia, particularly in urban areas like the capital city of Riyadh, a deterioration of air quality could be accompanied as a direct consequence of the massive increase in land transportation and the associated growth in the emission of air pollutants. In addition to these mobile sources of air pollution, there has been the growth in stationary sources of air pollution, such as industrial factories, desalination plants, power stations and oil refineries. A mobile lab was used to track air pollutants along with some meteorological parameters at selected sites in Riyadh city representing residential, industrial, urban, and urban/road areas. The concentration levels of particulate matter (PM10), nitrogen oxides (NOx), ozone (O3), carbon monoxide (CO), sulfur dioxide (SO2), hydrogen sulfide (H2S), volatile organic compounds (VOCs), aromatic hydrocarbons (PAHs), heavy metals (Pb, Zn, Cr, Ni) were measured through summer and winter seasons along with the climate parameters (temperature, relative humidity, pressure, rainfall, wind speed & direction). Air pollutants were found at the permissible limits. However, the concentration levels of nitrogen oxides, (H2S) and (SO2) at the industrial and urban/road areas exceeded the safe limits during summer season. In addition, there was a relationship between the climate of Riyadh city and distribution and concentrations of air pollutants.