Air quality

 What is the general situation with the ISSUE

The monitoring  of atmospheric air pollution in Tashkent is conducted by "Uzglavgidromet" periodically on the 12 substances. The quantitative characteristics of air quality is the total index of atmospheric pollution, which is determined as the sum of exceedings of break even norm on 5 substances with the highest concentration  and actual concentrations of each substance.

Scheme of location of posts Glavgidrmet on staking out
quality of  the atmospheric air 

Source: Scheme is prepared by using the GIS technology by Department of Ecoinformprognoz of the State Committee for Nature Protection of the Republic of Uzbekistan

According to the data of "Uzglavgidromet", in Tashkent the high level of  the atmospheric pollution is to be observed, moreover the total index of the atmospheric pollution has increased up from 5,62 in 1996 to 6,48 in 1999 at the expence of increase in emissions from autotransport and in emissions from big enterprises outside the city.
The quantity of dust in the air has droped because of improvement of sanitary condition of the city, but it is still higher than break even norms.
As compared with 1996, the concentration of nitrogen dioxide has increased on 50%, because of increase of burned fuel on autotransport; the concentration of ammonium hydrate has increased on 30% because of high use of old refrigeratory equipment and the emissions from enterprises of Chirchic town. Because of strengthenening of the Government control over toxicity level of exhausted gases from automobiles, the pollution of the atmosphere by the carbon oxide lowered.
The concentration of ozone has decreased on 43%, but it is still beyond the norm (1,3 of break even concentration). The average annual concentrations of other substances do not exceed the break even concentration. There are no observations on the content of super-toxic substances, and toxic compounds of lead in the city. In the structure of dust there is no solid particles, the size of which is up to 10 micron. They are the most harmful for the organs of breath. 

Diagrams data source: The Review of air pollution and harmful substances emissions in cities on the territory of Glavhydromet of the Republic of Uzbekistan activity from 1996 to 1999.