Māris kļaviņŠ, azamat azizov, JĀnis zaļoksnis environment, pollution, development: the case of uzbekistan

Figure 7.25. 
Changes 
of air pollutant 
concentrations during 
smog event 
Figure 7.26. 
National 
report on use of natural 
resources in Republis of 
Uzbekistan 2008 

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150 
ENVIRONMENT, POLLUTION, DEVELOPMENT:  THE CASE OF UZBEKISTAN
aggravating the course of chronic diseases. It should be noted that 
during the London-type smog the content of nitrogen oxides and 
carbon oxides also simultaneously increase in the air, and changes 
take place in the composition of airborne aerosols, i.e., the aerosols 
formed due to the incomplete combustion of fossil fuel become 
dominant. However, not only SO
2
 but also nitrogen oxides and 
hydrocarbons are sorbed on such sprays. Upon aerosol inhalation 
these substances can desorb into the lungs and enter the circulatory 
and lymphatic system, affecting the functions of the heart rate and 
other organs. During the London smog the growing concentration 
of pollutants in the air can increase human mortality and acute 
exacerbation of diseases, as it was recorded in London, in December 
1952 (Figure 7.27).
It should be noted however that the occurrence of the London-
type smog in the developed world today is greatly reduced, taking 
into account the improved fuel combustion technologies, exhaust gas 
treatment and other air pollution control methods.