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Figure 3.4.2

 

Impact of Regulations of Traffic Emissions on  PAH Level in the Air

Figure 3.4.2. The elevation of air pollutants during the long-range transport episode on 22 April 1996 normalised to the average levels. Abbreviations: see the legend to Fig. 1-3. The atmospheric processes caused a heavy increase in the levels of mutagenic activity, TA98+S9, TA98-S9 and TA98NR. The long-range transport increased also the levels of the S-PAC, DBT and BNT, the oxy-PAH, BAO and sulphur dioxide. The long-range transport contribution of the reference PAH, BbjkF) and BeP was much minor. The reactive PAH, CP and BaP was depleted during the transport by atmospheric degradation. Local sources were the dominant ones for the components related to traffic pollution, i.e. the PAH: BghiP and Cor and the inorganic gases, nitrogen monoxide (NO), gas <NOBR>NO<SUB>y</SUB></NOBR> and CO.</EM> (6 Kb)

Fig. 3.4.2: The elevation of air pollutants during the long-range transport episode on 22 April 1996 normalised to the average levels. Abbreviations: see the legend to Fig. 1-3. The atmospheric processes caused a heavy increase in the levels of mutagenic activity, TA98+S9, TA98-S9 and TA98NR. The long-range transport increased also the levels of the S-PAC, DBT and BNT, the oxy-PAH, BAO and sulphur dioxide. The long-range transport contribution of the reference PAH, BbjkF) and BeP was much minor. The reactive PAH, CP and BaP was depleted during the transport by atmospheric degradation. Local sources were the dominant ones for the components related to traffic pollution, i.e. the PAH: BghiP and Cor and the inorganic gases, nitrogen monoxide (NO), gas NOy and CO.