Wintertime Heavy Haze Episodes in Northeast China Driven by Agricultural Fire Emissions
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
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Detail(s)
Original language | English |
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Pages (from-to) | 150-157 |
Number of pages | 8 |
Journal / Publication | Environmental Science and Technology Letters |
Volume | 11 |
Issue number | 2 |
Online published | 22 Jan 2024 |
Publication status | Published - 13 Feb 2024 |
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Abstract
Heavy haze events occur frequently over northeast China during the winter, despite the successful implementation of the Clean Air Act, which primarily targets fossil fuel sources, in recent years. Agricultural fires have been suggested as one of the main causes of these haze episodes. However, their regional contribution to fine particulate matter (PM2.5) pollution has not been systematically evaluated. In this study, we use the GEOS-Chem model to investigate the role of agricultural fires in heavy haze episodes from December 2018 to March 2019 in Heilongjiang province. Our results show significant discrepancies between the simulated and observed PM2.5 concentrations during severe haze pollution days. By increasing agricultural fire emissions in the GFED4s inventory by a factor of ∼23, we are able to better replicate the haze episodes in the model, indicating a severe under-representation of agricultural fires in the inventory. Furthermore, the baseline simulation overestimates the observed black carbon to organic carbon ratio in Harbin, suggesting a biased emission ratio specified in the inventory. Our assessment underscores that agriculture fires constitute the main cause of the extreme haze episodes during the study period, and a strictly implemented ban would improve air quality with substantial health benefits. © 2024 American Chemical Society.
Research Area(s)
- emission inventory, haze, northeast China, particulate matter, straw burning
Citation Format(s)
In: Environmental Science and Technology Letters, Vol. 11, No. 2, 13.02.2024, p. 150-157.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review