Cause Analysis of PM2.5 pollution during the COVID-19 lockdown in Nanning, China
| Autor: | Liu Huilin, Mo Zhaoyu, Kaixian Zhu, Zhang Dabiao, Shanshan Wang, Bin Zhou, Huang Jiongli, Zhiming Chen, Mu Yijun |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Pollution
Haze 010504 meteorology & atmospheric sciences media_common.quotation_subject Science Air pollution 010501 environmental sciences Aethalometer medicine.disease_cause Atmospheric sciences 01 natural sciences Article medicine Planetary science 0105 earth and related environmental sciences media_common Biomass (ecology) Multidisciplinary Natural hazards Particulates Aerosol Environmental sciences Lidar Environmental science Medicine |
| Zdroj: | Scientific Reports, Vol 11, Iss 1, Pp 1-13 (2021) Scientific Reports |
| DOI: | 10.21203/rs.3.rs-238971/v1 |
| Popis: | To analyse the cause of the atmospheric PM2.5 pollution that occurred during the COVID-19 lockdown in Nanning, Guangxi, China, a single particulate aerosol mass spectrometer, aethalometer, and particulate Lidar coupled with monitoring near-surface gaseous pollutants, meteorological conditions, remote fire spot sensing by satellite and backward trajectory models were utilized during 18–24 February 2020. Three haze stages were identified: the pre-pollution period (PPP), pollution accumulation period (PAP) and pollution dissipation period (PDP). The dominant source of PM2.5 in the PPP was biomass burning (BB) (40.4%), followed by secondary inorganic sources (28.1%) and motor vehicle exhaust (11.7%). The PAP was characterized by a large abundance of secondary inorganic sources, which contributed 56.1% of the total PM2.5 concentration, followed by BB (17.4%). The absorption Ångström exponent (2.2) in the PPP was higher than that in the other two periods. Analysis of fire spots monitored by remote satellite sensing indicated that open BB in regions around Nanning City could be one of the main factors. A planetary boundary layer-relative humidity-secondary particle matter-particulate matter positive feedback mechanism was employed to elucidate the atmospheric processes in this study. This study highlights the importance of understanding the role of BB, secondary inorganic sources and meteorology in air pollution formation and calls for policies for emission control strategies. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|