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- W2740354655 abstract "PM 2.5 and PM 2. 5 10 samples were collected at SJosdos Campos (SPaulo) from February 2004 to February 2005. During this time there were two periods of drought, one lasting for 25 consecutive days and a second one for 38 days. The later exhibited higher PM concentrations values than the first one. Data were divided into two groups, one comprising all measurements carried out during the 63 days without rain (dry period) and a second one comprising the remaining data (regular period). The PM 2.5 and PM 2. 5 10 average concentrations were respectively 23 ± 7.5 and 19 ± 7.9 μg m −3 during dry period and 14 ± 7.9 and 13 ± 7.9 μg m −3 during regular period. There was a day-of-week variation with highest average concentrations on Wednesday (PM 2.5 ) and Thursday (PM 2. 5 10 ) and lowest on Sunday. The PM 2. 5 10 exhibited the most pronounced variation suggesting an association with vehicular emissions. During both dry and regular periods, average SO 2− 4 and NH + concentrations were about 5 times higher in the fine than in the coarse fraction. PM 2.5 ionic concentrations, especially that of K + , were higher in the dry period compared to regular one (except for Cl − , Na + and Mg 2+ ). Hierarchical cluster analysis and backward air mass trajectories indicate that during the dry period NO − , SO 2− 4 , NH + and K + associated with PM 2.5 are significantly influenced by continental sources." @default.
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- W2740354655 date "2011-01-01" @default.
- W2740354655 modified "2023-09-27" @default.
- W2740354655 title "VARIAC ¸ ˜ OES TEMPORAIS DO MATERIAL PARTICULADO INAL ´ AVEL FINO E GROSSO EINORG ˆ ANICOS SOL ´" @default.
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