Sluyter, ed., (1995) reported that exceedances of the 1987 (24 h) WHO AQG of 150

Tg/m; for NO2 were observed at background locations in 12 of 40 cities from which

data on daily measurements throughout the year were available. The maximum 24

hour average concentration at a city background site reported from these 40 cities in

1989-91 was 616 Tg/m;. The maximum 1 hour average concentration was 532

Tg/m;. The maximum 24-hour value and the maximum 1-hour value from the 40

cities, were reported from different monitoring sites.

The report by the European Topic Centre on Air Quality, on European Air Quality

1993 (Larssen et al., 1995) contained NO2 data from 90 cities (194 sites in total, of

which 80 are in Germany). Most of the cities can be classified as urban background

sites, but traffic exposed sites are probably also represented in the data. Annex VI

gives an overview of the measured concentrations for the 50-percentile (median), 98-

percentile and maximum 1 hour.

 

 

 

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