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The gas-phase ammonia (NH3) and fine particle PM2.5 ammonium (pNH4+) (collectively, NHx) were monitored between July 2013 and August 2014 in a busy traffic area of Nanjing, China. Results showed that PM2.5 concentration was 66.7 μg m−3, and NH3 concentration was 6.66 μg m−3. In the PM2.5, the concentration of pNH4+ was 3.04 μg m−3, SO42− (pSO42−) was 10...
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