Peroxyacetyl nitrate observed in Beijing in August from 2005 to 2009
Gao Tian-Yu
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Zhang Jian-Bo
DOI:
Received November 30, 2013,Revised January 10, 2014, Accepted January 28, 2014, Available online 2014-07-19
Volume ,,Pages -
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Measurements of peroxyacetyl nitrate (PAN) were made at a Beijing urban site each August from 2005 to 2009. Over this 5-year’s Augusts period, average PAN concentration for August in each year increased from 3 μg/m3 (2005) to 11.7 μg/m3 (2007); however, they decreased rapidly in 2008 (4.1 μg/m3). Generally, the variation for each August in 5 years showed a rise in the first part of the year followed by a decline. We considered two categories of local and regional air masses in this study, which revealed that PAN concentration in Beijing were affected mainly by southeastern air masses. The variation for each August in 5 years of PAN was influenced predominantly by local air masses in 2005, but by 2009 regional air masses had become more important. This study showed the level and variation of PAN for the August in 5 years for the first time, and proved that the control measures are useful to decrease the photochemical pollution, hence, these measures are probably feasible for other megacities too. Furthermore, this method of analyzing the regional and local impacts might be useful for other studies too.
