Author(s)

H. Noordijk

Abstract

The national smog warning system in The Netherlands; a combination of measuring and modelling H. Noordijk Laboratory of Air Research, National Institute of Public Health and Environmental Protection (WFM;, P.O. Boz J, 3720 BA Bm/to%en, The Netherlands ABSTRACT A national smog warning system has been operational in the Netherlands for several years. This system is based on the combination of measurements and air pollution models. In summer, ozone forecasts are made, whereas in winter the system is based on the sum of SO% and PM^ (fine particles). In the case of ozone, the statistical procedure appears to be superior to the atmospheric transport model. Only a few minor winter smog episodes have been recorded in the past years, the reliability of the models for SO2 is therefore less well known than for ozone. 1 INTRODUCTION During smog episodes, concentrations of a number of air pollutants are elevated to levels which may cause harmful health e

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