In this paper are in detail analyzed values for air quality that have been extracted in monitoring sites in Belgrade since September first in 2010 until September first in 2011. Values extracted in the stations Square Slavija and Despot Stefan Boulevard was analyzed. The main task of this paper is to present the inferred air quality, while the main aim represents the checking of obtained data in respect to limit pollution values. Analyses were done for annual, seasonal, monthly and daily values.