Extremely severe haze weather events occurred in many cities in China, especially in the
east part of the country, in January 2013. Comprehensive measurements including hourly
concentrations of PM 2.5 and its major chemical components (water-soluble inorganic ions,
organic carbon (OC), and elemental carbon (EC)) and related gas-phase precursors were
conducted via an online monitoring system in Suzhou, a medium-sized city in Jiangsu
province, just east of Shanghai. PM 2.5 (particulate matter with an aerodynamic diameter of …

A comprehensive measurement was carried out to analyze the heavy haze events in
Suzhou in January 2013 when extremely severe haze pollution occurred in many cities in
China especially in the East. Hourly concentrations of PM2. 5, chemical composition
(including water-soluble inorganic ions, OC, and EC), and gas-phase precursors were 5
obtained via on-line monitoring system. Based on these data, detailed aerosol composition,
light extinction and gas-phase precursors were analyzed to understand the characteristics of …