Ground Level Concentrations of Ozone, Oxidant, PAN and Precursors in the Netherlands During the Last Two Decades and the Relation with the LOTOS-Model

PeroxyAcetylNitrate (PAN), ozone (O3), nitrogen oxides (NOx) and hydrocarbons (C2-C4) are measured at several ground level stations in The Netherlands from 1973 onwards. The hydrocarbon measurements at Delft and Moerdijk show the existence of large industrial sources. Analysis of the annual mean values of the compounds has brought about the following results: