Ambient Air Levels Of Volatile Organic Compounds (voc) And Nitrogen Dioxide (no_2) In A Medium Size City In Northern Spain

摘要

Ambient concentrations of volatile organic compounds (VOC) and nitrogen dioxide (NO_2) were measured by meansof passive sampling at 40 sampling points in a medium-size city in Northern Spain, from June 2006 to June 2007. VOC and NO_2 samplers were analysed by thermal desorption followed by gas chromatography/mass-selective detector and by visible spectrophotometry, respectively. Mean concentrations of benzene, toluene, ethylbenzene, xylenes, propylbenzene, trimethylbenzenes, and NO_2 were 2.84, 13.26, 2.15, 6.01, 0.59, 1.32 and 23.17 μg m~(-3) respectively, and found to be highly correlated. Their spatial distribution showed high differences in small distances and pointed to traffic as the main emission source of these compounds. The lowest levels of VOC and NO_2 occurred during summer, owing to the increase in solar radiation and to lower traffic densities. Mean concentrations of benzene and NO_2 exceeded the European limits at some of the monitored points.