In order to identify main sources and their characteristics of PM2.5 in atmosphere, filter samples of PM2.5 were collected at five receptors in Shenzhen during March, June, September and December in 2014. Mass concentrations and chemical compositions were analyzed, then the positive matrix factorization (PMF) model was applied for source apportionment. The results showed the annual mean concentration of PM2.5 reached 35.7μg/m3 in Shenzhen in 2014, with vehicle emissions, secondary sulfate, secondary organic aerosol (SOA) and secondary nitrate identified as the major sources, contributing 27%, 21%, 12%, and 10% to PM2.5, respectively. Fugitive dust, biomass combustion, ship emissions, industrial emissions, marine emissions, building dust and coal burning each contributed 2%~6%.The tempo-spatial variations of sources revealed that secondary sulfate, biomass combustion, SOA, industrial emissions, ship emissions and marine emissions had obvious regional pollution characteristics; however, vehicle emissions, secondary nitrate, coal burning, fugitive dust and building dust showed obvious local emission characteristics.
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