Book ; Article ; Online: Mitigating NO_x emissions does not help alleviate wintertime particulate pollution in Beijing-Tianjin-Hebei (BTH), China
2020
Abstract: ... in January 2019 in the BTH reveal that NO_x emissions mitigation does not help lower wintertime nitrate and ... decreased by over 20%. It still remains elusive about contributions of nitrogen oxides (NO_x) emissions ... by NO_x mitigation offsets the HNO₃ loss and enhances sulfate and secondary organic aerosols formation ...
| Abstract | Stringent mitigation measures have reduced wintertime PM_(2.5) concentrations by 42.2% from 2013 to 2018 in the BTH. The observed nitrate aerosols have not exhibited a significant decreasing trend and constituted a major fraction (about 20%) of the total PM_(2.5), although the surface-measured NO₂ level has decreased by over 20%. It still remains elusive about contributions of nitrogen oxides (NO_x) emissions mitigation to the nitrate and PM_(2.5) level. The WRF-Chem model simulations of a persistent haze episode in January 2019 in the BTH reveal that NO_x emissions mitigation does not help lower wintertime nitrate and PM_(2.5) concentrations under current conditions in the BTH, because the substantial O₃ increase induced by NO_x mitigation offsets the HNO₃ loss and enhances sulfate and secondary organic aerosols formation. Our results are further consolidated by occurrence of the severe PM pollution in the BTH during the COVID-19 outbreak with a significant reduction of NO₂. |
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| Keywords | covid19 |
| Publishing date | 2020-09-02 |
| Publishing country | us |
| Document type | Book ; Article ; Online |
| Database | BASE - Bielefeld Academic Search Engine (life sciences selection) |
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