Filed burnings of 5 major agricultural straws are simulated using the aerosol chamber system. Detailed chemical compositions including OC-EC, water-soluble inorganic salts (WSI), water-soluble aminiums (WSA), water-soluble organic acids (WSOA), 16 PAHs, 5 Phenols, and 8 trace heavy metals (THM) in smoke PM2.5 and PM1.0 are characterized. The corresponded emission factors of particulate species are also established. The carbonaceous particles comprise 16-33 wt.% WSI. The proportions of WSI and EC are larger in PM1.0, while the fractions of OC, WSOA, PAHs, Phenols, and elemental metals reside more in PM2.5. From single particle analysis, THM are mainly from fly ashes of straw burning aerosol.To assess health effect and help source-specific air quality control, permissible exposure limits (PEL) of smoke PM2.5 are assessed for carcinogenic risk concern using selected hazard pollutants including PAHs and THM. Daily exposure concentration should be constrained within 0.2, 0.3, 0.4, 1.4, and 0.8 μg m3 for wheat, corn, rice, cotton, and soybean straw, respectively. Based on different versions of crop straw open burning rates, the new emission inventories of primary particulate matters from agricultural field burning in 2012 are estimated and named as BAU-I, BAU-II, EM-I, EM-II, and NDRC scenarios. The emissions are further temporal-spatially allocated into different regions at summer and autumn open burning periods. For model convenience, six zones are classified by geographic regions and economic area in China. The estimated total emissions in 2012 are PM2.5 0.74-1.24 x103, OC 0.32-0.53 x103, EC 0.09-0.16 x 103, WSOA 18.77-30.82, WSA 4.23-7.19，PAHs 0.35-0.59 , Phenols 2.02-3.40, and THM 6.36-10.64 Gg. Less than 25 % of the emissions are released from summer field burnings that are mainly contributed by the North Plain and the Central of China.

Multi-pollutants emitted from major agricultural residues burning and the impact on air quality in China

251st National Meeting (2016)

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