Ozone pollution in the North China Plain spreading into the late-winter haze season

Proceedings of the National Academy of Sciences, Journal Year: 2021, Volume and Issue: 118(10)

Published: March 1, 2021

Surface ozone is a severe air pollution problem in the North China Plain, which home to 300 million people. Ozone concentrations are highest summer, driven by fast photochemical production of hydrogen oxide radicals (HO

Language: Английский

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Aqueous production of secondary organic aerosol from fossil-fuel emissions in winter Beijing haze

Proceedings of the National Academy of Sciences, Journal Year: 2021, Volume and Issue: 118(8)

Published: Feb. 15, 2021

Secondary organic aerosol (SOA) produced by atmospheric oxidation of primary emitted precursors is a major contributor to fine particulate matter (PM

Language: Английский

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Light absorption of black carbon and brown carbon in winter in North China Plain: comparisons between urban and rural sites

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 770, P. 144821 - 144821

Published: Jan. 27, 2021

Language: Английский

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Direct evidence of local photochemical production driven ozone episode in Beijing: A case study

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 800, P. 148868 - 148868

Published: Aug. 5, 2021

Language: Английский

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Current challenges of improving visibility due to increasing nitrate fraction in PM2.5 during the haze days in Beijing, China

Environmental Pollution, Journal Year: 2021, Volume and Issue: 290, P. 118032 - 118032

Published: Aug. 24, 2021

Language: Английский

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Unexpected Increases of Severe Haze Pollution During the Post COVID‐19 Period: Effects of Emissions, Meteorology, and Secondary Production

Journal of Geophysical Research Atmospheres, Journal Year: 2022, Volume and Issue: 127(3)

Published: Jan. 28, 2022

Abstract Unexpectedly frequent severe haze episodes were observed in Beijing during February–March 2021 after two phases of clean air action plan (2013–2020), yet the causes remained unclear. Here, we conducted real‐time fine particle (PM2.5) composition measurements January–March using a time‐of‐flight aerosol chemical speciation monitor and an aethalometer compared with those coronavirus disease (COVID‐19) period 2020. Our results showed ubiquitously elevated concentrations chloride, black carbon (BC), primary organic (POA) 2021, suggesting increased emissions post‐COVID‐19 period. By machine learning‐based random forest (RF) algorithm, found largely different responses changes to meteorology months. After decoupling effects meteorology, PM2.5 from 2020 reduced −35.6% −29.0% January, −24.1% −4.5% February, +92.6% +34.2% March, respectively. demonstrate dominant roles stagnant secondary production formation March 2021. In particular, that compositions deweathered fairly similar between ratios OA inorganic aerosols close. study indicates influence meteorological conditions is great importance for better evaluation mitigating strategies pollution due large impact on species particularly short

Language: Английский

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Measurement report: Long-term changes in black carbon and aerosol optical properties from 2012 to 2020 in Beijing, China

Atmospheric chemistry and physics, Journal Year: 2022, Volume and Issue: 22(1), P. 561 - 575

Published: Jan. 14, 2022

Abstract. Atmospheric aerosols play an important role in the radiation balance of earth–atmosphere system. However, our knowledge long-term changes equivalent black carbon (eBC) and aerosol optical properties China is very limited. Here we analyze 9-year measurements eBC from 2012 to 2020 Beijing, China. Our results showed large reductions by 71 % 6.25 ± 5.73 µg m−3 1.80 1.54 47 decreases light extinction coefficient (bext, λ = 630 nm) fine particles due Clean Air Action Plan that was implemented 2013. The seasonal diurnal variations illustrated most significant fall at nighttime, respectively. ΔeBC / ΔCO also annual decrease ∼ 7 4 ng ppbv−1 presented strong with high values spring fall, indicating primary emissions Beijing have changed significantly. As a response Plan, single-scattering albedo (SSA) considerable increase 0.79 0.11 0.88 0.06, mass efficiency (MEE) increased 3.2 3.8 m2 g−1. These highlight increasing importance scattering radiative forcing future challenge visibility improvement enhanced MEE. Brown (BrC) similar during 2018–2020. found secondary BrC total seasons, particularly summer contribution up 50 %, demonstrating formation recent years. affected effect. direct (ΔFR) BC decreased 67 +3.36 W m−2 +1.09 2020, +0.30 +0.17 Such might implications for affecting aerosol–boundary layer interactions air quality.

Language: Английский

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High-resolution Simulation Dataset of Hourly PM2.5 Chemical Composition in China (CAQRA-aerosol) from 2013 to 2020

Advances in Atmospheric Sciences, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 22, 2025

Language: Английский

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The Influence of Heterogeneous Processes on the Physicochemical Properties of Atmospheric Aerosols

Advances in Atmospheric Sciences, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 22, 2025

Language: Английский

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Variation in PM2.5 Chemical Composition During the Heating Seasons from 2018–2019 to 2020–2021 in Harbin: Response to Mitigation Strategies

Aerosol Science and Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 3, 2025

Language: Английский

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