MEASUREMENTS OF NO2 CONCENTRATIONS IN THE AIR USING PASSIVE PALMES SAMPLERS .2. FIELD STUDIES

The results of field studies using passive sampling tubes according to Palmes for the determination of NO2 are described. Investigations wer e made at roads with heavy traffic in Berlin. The immission (ambient) concentrations measured were compared with the results of automatic mo nitors used by the Berliner Luftgutemessnetz (BLUME). Compared with th e measurement results of the automatic monitors, in most cases there w ere no remarkable deviations, except for some measurement sites. Regar ding the results of all measurements carried out, the passive Palmes s amplers are suitable for screening measurements of ambient NO2 concent rations, e.g. with regard to 40 (2) BIm-SchG. However, they cannot sub stitute automatic monitor measurements. In practical use, the special outdoor conditions have to be taken into consideration, especially the different flow conditions varying with the kind of installation of th e samplers and the choice of the measurement sites.