In the paper the actuality of air quality issue is pointed out, the chemical, physical and energetic components of atmospheric pollutants are briefly characterized. The energetic state of air is pointed out as a special indicator of air quality.The classification and structure of positive and negative light air ions are viewed. Paper briefly presents the basics of atmospheric air ionization theory and impact of ionization on biotic and non-biotic components of natural environment, especially pointing out the physiological influence of positive and negative light air ions on human’s body.Paper presents the results of air ionization and some meteorological factors like measurements performed in different parts of the Rezekne city during July – August 2009. Residental areas, busiest traffic junctions, industrial zones and recreational areas were included in grid of measure points covering almost all the city. Measurements were performed using Portable air-ion counter "Saphire-3м" (made in Russia) with minimal resolution - 10 ions per 1 cm3. There are drawn conclusions that average level of air ion concentrations in Rezekne has medial value. It is briefly characterized how the infrastructure of the city impacts the air quality in it. Average dominance of negative ions over positive ones was observed in the city center and in territories out of industrial zones and transportation hubs. These territories are of the most suitable quality of air energetic state for humans living. The daily trend of growing of positive air ion concentration and decrease of negative ion concentration in afternoon was observed. Supposedly it is due to increasing of different aerosol pollution emissions during daytime. There are made proposals about possible spatial development of the city in future.