English Abstract In this report, monitoring results from the National
Air Quality Monitoring Network are presented covering the calendar year 1990
and the period April 1989-April 1990. The components reported are SO2 black
smoke, NO2, NOx (=NO2 + NO), NO, O3, OX (= NO2 + O3) and CO. In 1990
several summer smog episodes occured which contributed to exceedances of the
Dutch draft air quality limit value for O3 at 2 stations. One station is
sited near an industrial area ; the other is typical of a more rural area.
The draft guide value voor O3 was exceeded at all stations. At one station
some limit values for black smoke and NO2 were exceede. This station is
representative of very busy streets in larger cities. There are ca. 100
such streets in the Netherlands.