Substantial changes in gaseous pollutants and chemical compositions in fine particles in the North China Plain during the COVID-19 lockdown period: anthropogenic vs. meteorological influences

Li, Rui; Zhao, Yilong; Fu, Hongbo; Chen, Jianmin; Peng, Meng; Wang, Chunying

doi:https://doi.org/10.5194/acp-21-8677-2021

Articles | Volume 21, issue 11

https://doi.org/10.5194/acp-21-8677-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-21-8677-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 21, issue 11

Research article

|

09 Jun 2021

Research article |

| 09 Jun 2021

Substantial changes in gaseous pollutants and chemical compositions in fine particles in the North China Plain during the COVID-19 lockdown period: anthropogenic vs. meteorological influences

Rui Li, Yilong Zhao, Hongbo Fu, Jianmin Chen, Meng Peng, and Chunying Wang

Supplement

https://doi.org/10.5194/acp-21-8677-2021-supplement

Data sets

Hourly meteorological data of all of the sites in China China Meteorological Administration http://data.cma.cn/en

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Short summary

Based on a random forest model, the strict lockdown measures significantly decreased primary components such as Cr (−67 %) and Fe (−61 %) in PM_2.5 (p < 0.01), whereas the higher relative humidity (RH) and NH₃ level and the lower air temperature (T) remarkably enhanced the production of secondary aerosol including SO₄²⁻ (29 %), NO₃⁻ (29 %), and NH₄⁺ (21 %) (p < 0.05). The natural experiment suggested that the NH₃ emission should be strictly controlled.