WHO has also made exposure estimates for NO2, (WHO C 1995). The estimates are

made on the basis of outdoor concentrations, and it was assumed that these were

representative for the air pollution levels people are exposed during their daily

activities. The outdoor levels were estimated from measurements and air quality

modelling.

The estimated percentage of the population exposed to concentrations above the

WHO 1987 24 hour AQG in the studied cities is shown in table 2.1. No estimates are

available for exposure above new (1996) WHO AQG.

 

 

 

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