In 25 of the cities reported by the WHO CET study, inhabited by 21 million people,

daily average NO2 concentration exceeded the WHO AQG (1987) of 150 Tg/m;. In

most cities the exceedances occurred less than 10 times per year and were more

frequent in Western than in Eastern European cities.

Urban air concentrations of NO2 in major European cities 1985 - 1990, are

summarised in Sluyter, ed (1995). Only cities with more than 500,000 inhabitants

were included in contrast to the WHO study which included smaller cities. Annual

average NO2 concentrations were similar in many of the Western European cities.

During 1990 the mean of the annual NO2 concentrations in 22 cities was 46 Tg/m;

16

with a standard deviation of only 6 Tg/m;. The average concentrations in 26 cities in

former Soviet Union were the same, 46 Tg/m;, but the variations were larger; with a

standard deviation of 22 Tg/m;.

 

 

 

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