The paper presents the results of studying and evaluating the ambient air pollution in Tashkent in 2003-2005 according to the City Center of State Sanitary-and-Epidemiological Surveillance Service. In Tashkent, the proportion of chemically unstandard (higher than the maximum permissible concentrations) samples of ambient air was ascertained to higher than that in Uzbekistan towns as a whole. Soot, acrolein, formaldehyde, dust, benzene, aromatic carbohydrates, and nitric oxide are the most significant hygienic ingredients. The pollution levels are different in various districts of the city.