Insights into the characteristics and sources of primary and secondary organic carbon: High time resolution observation in urban Shanghai.

There is growing evidence suggesting that organic aerosols play an important role in the evolution of severe haze episodes. However, long-term investigations of the different characteristics of carbonaceous aerosols during haze and non-haze days are insufficient. In this work, hourly measurements of organic carbon (OC) and elemental carbon (EC) in PM were conducted in Shanghai, a megacity in Eastern China, over the course of a year from July 2013 to June 2014.

Chemical characteristics and sources of PM during the 2016 summer in Hangzhou.

During the 2016 Hangzhou G20 Summit, the chemical composition of submicron particles (PM) was measured by a High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) along with a suite of collocated instruments. The campaign was undertaken between August 5 and September 23, 2016. The impacts of emission controls and meteorological conditions on PM chemical composition, diurnal cycles, organic aerosol (OA) source apportionment, size distribution and elemental ratios were characterized in detail.

Characteristics and origins of air pollutants in Wuhan, China, based on observations and hybrid receptor models.

Unlabelled: To identify the characteristics of air pollutants and factors attributing to the formation of haze in Wuhan, this study analyzed the hourly observations of air pollutants (PM, PM, NO, SO, O, and CO) from March 1, 2013, to February 28, 2014, and used hybrid receptor models for a case study. The results showed that the annual average concentrations for PM, PM, NO, SO, O, and CO during the whole period were 89.6 μg m, 134.