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

participate in the ozone 
disintegration cycle. A 
significant source of 
nitrogen oxides in strato‑
sphere are the supersonic 
aircrafts. At the same 
time, the nitrogen oxides 
in the stratosphere can 
undergo alterations that 
result in regeneration of 
particles with reactive 
capacity that are able 
to produce ozone. An 
important role in the 
atmosphere is played by 
the processes leading to 
the formation of nitric 
acid, HNO
3
.
NO
2
 + HO. → HNO
3
 
Figure 7.18. 
Nitrogen 
oxide concentrations 
and changes of traffic 
intensity in the streets 
of Riga (Gertrude Street, 
August) 

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7. AIR POLLUTION
 135
NO
x
 emissions has increased, while energy production impact has 
been reduced almost by half, which is explained by the significant 
increase in the number of vehicles and the fact that natural gas is 
used more and more for energy purposes. Since 2000, the increase 
in energy production has gradually scaled up the nitrogen oxide 
emissions from the combustion plants. The established maximum 
allowable nitrogen oxide emission in the air for 2010 was 61 kilotons.
One of the major contemporary sources of NO
x
 emissions is 
traffic (Table 7.4). The traffic can be considered a major source of 
emissions of nitrogen oxides particularly in the urban environ ment.
Table 7.4.