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

Particulate
matter
Eutrophication Pesticides Heavy metals Microbial
pollution
Significance of a fac
to
r
The waters are polluted, 
if substances or physical 
conditions have changed 
the water composition 
and properties to such 
an extent that the func‑
tioning of its ecosystems 
is affected, or the water 
use for specific purposes 
is restricted. Water pollu‑
tion can also be caused 
by such changes in water 
composition, in the result 
of which the substance 
content present in the 
water substantially differ 
from that which existed 
before. However, is it is 
not always possible to 
determine this initial 
water quality in the areas 
that have been popula‑
ted for a long time
Figure 8.1. 
Rating of 
global water pollution 
(0 – water quality is not 
affected; 1 – the waters 
are polluted, but using 
appropriate protective 
measures, they can be 
used; 2 – water pollution 
can cause significant risk 
to human health)

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ENVIRONMENT, POLLUTION, DEVELOPMENT:  THE CASE OF UZBEKISTAN
According to its source, water can be classified as follows:
 
Š
surface water (rivers, lakes, seas, oceans);
 
Š
underground water, spring water;
 
Š
precipitation water (rain, snow, ice water, dew, fog);
 
Š
waste water.
This division is conditional, because the water is in constant 
motion during the cycle (hydrologic cycle) and therefore any 
classi fi cation reflects only a certain part of the cycle, in which the