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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Stronger secondary pollution processes despite decrease in gaseous precursors: A comparative analysis of summer 2020

Hui Li1, Yongliang Ma1, Fengkui Duan1

  • 1State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Tsinghua University, Beijing, 100084, China.

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COVID-19 lockdowns reduced gaseous pollutants but worsened particle pollution, with increased PM2.5 and PM10 in China. Enhanced secondary formation and sandstorms contributed to higher particle pollution, while VOC control is key for ozone reduction.

Keywords:
COVID-19O(3) pollutionOxidizing capacityPM(x) distributionSecondary formation

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Area of Science:

  • Atmospheric Chemistry and Air Quality
  • Environmental Science
  • Public Health

Background:

  • COVID-19 lockdowns in China led to reduced offline activities and emissions.
  • This provided a unique opportunity to assess air quality responses to emission controls.
  • Previous studies focused on gaseous pollutants, but particle pollution dynamics require further investigation.

Purpose of the Study:

  • To investigate the impact of COVID-19 lockdowns on air quality in China, focusing on particulate matter (PM2.5 and PM10) and ozone (O3).
  • To understand the chemical mechanisms driving changes in particle pollution, including secondary formation processes.
  • To identify key factors contributing to severe haze events and provide insights for future air pollution control strategies.

Main Methods:

  • Comparative analysis of air pollution data from summers 2019 and 2020.
  • Analysis of gaseous pollutants, particulate matter (PM2.5, PM10), and ozone concentrations.
  • Calculation of sulfate oxidation rate (SOR) and nitrate oxidation rate (NOR) to assess secondary formation.
  • Examination of PMx distribution and chemical composition (sulfate, nitrate).
  • Assessment of the role of nitrogen oxides (NOx) and volatile organic compounds (VOCs) in ozone pollution.

Main Results:

  • Gaseous pollutants significantly decreased in summer 2020 compared to 2019.
  • PM2.5 and PM10 levels increased in summer 2020, attributed to sandstorm events and enhanced secondary formation (higher SOR and NOR).
  • Severe haze correlated with particles in the 1-2.5 μm size range, with nitrate playing a significant role.
  • Ozone concentrations were higher in 2020, despite reduced NOx, indicating a VOC-limited regime.

Conclusions:

  • Lockdowns effectively reduced gaseous pollutants but led to more severe particle pollution due to secondary formation and external sources like sandstorms.
  • Nitrate's role in secondary particle formation and its distribution suggest complex interactions in haze events.
  • Beijing operates under a VOC-limited condition, highlighting the need for VOC emission control to mitigate ozone pollution.