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The dominant mechanisms for the formation of fine particulate nitrate during four seasons were proposed by evaluating the correlations between [NO3−]/[SO42−] and [NH4+]/[SO42−]. Size-resolved aerosols were collected in Shanghai from April 2013 to January 2014. The concentration of fine particulate nitrate was below one tenth of the concentration of sulfate in summer, whereas fine particulate nitrate...
Size-resolved effective density of 50–400 nm urban particles was determined by a TDMA–APM system in Shanghai during wintertime. The average effective density ranged from 1.36 to 1.55 g cm−3, increasing with the particle diameter. The size dependent increase of density was consistent with previous hygroscopic measurements. We attributed the increase in density to the condensation of hygroscopic secondary...
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