05 July 2012, PDF |
127 pages |
Mooibroek D, Beijk R, Hoogerbrugge R
RIVM Report 680704011
Measurements made by the Dutch National Air Quality Monitoring Network (LML) demonstrate that the concentrations of atmospheric pollutants measured in 2009 are not markedly different from those of preceding years. This lack of change can be partly explained by the weather conditions in recent years, which have not changed substantially. Sporadic high concentrations of pollutants did occur, as indicated by the measurement results for 2009 from the LML, which is managed by the RIVM. The last few years have seen a renewal of a substantial part of the LML, and collaboration with other monitoring networks has been intensified. The measurements of the LML and other monitoring networks are presented in the "Jaaroverzicht Luchtkwaliteit 2009", which provides an overview of measured and partially modeled air quality. The nitrogen oxide concentrations have remained stable during the last few years. Exceedance of the EU limit value for the annual average occurred in 2009 at the majority of traffic-dominated monitoring sites. Similar behavior was found in previous years. There was no exceedance of the limit values for particulate matter (PM10) at any of the monitoring sites in 2009. The concentrations of particulate matter in 2009 are comparable to those of previous years but show, over the longer term, a descending trend. Ozone levels above the EU alert threshold (smog alert) were not observed in 2009.