4.7 Article

The effect of COVID-19 restrictions on atmospheric new particle formation in Beijing

Related references

Note: Only part of the references are listed.
Article Multidisciplinary Sciences

Enhanced secondary pollution offset reduction of primary emissions during COVID-19 lockdown in China

Xin Huang et al.

Summary: The study indicates that during the COVID lockdown, haze was mainly driven by enhanced secondary pollution, particularly due to the significant decrease in NOx emissions from transportation. This highlights the need for a coordinated and balanced strategy to control multiple pollutants for haze mitigation.

NATIONAL SCIENCE REVIEW (2021)

Article Environmental Sciences

Significant concurrent decrease in PM2.5 and NO2 concentrations in China during COVID-19 epidemic

Biwu Chu et al.

Summary: The strict control measures and social lockdowns implemented to combat the COVID-19 epidemic have significantly reduced air pollutant concentrations, particularly NO2 and PM2.5. Research supports reducing PM2.5 pollution by controlling NOx but also emphasizes the need for coordinated control of other pollutants.

JOURNAL OF ENVIRONMENTAL SCIENCES (2021)

Article Engineering, Environmental

Contribution of Atmospheric Oxygenated Organic Compounds to Particle Growth in an Urban Environment

Xiaohui Qiao et al.

Summary: The study in urban Beijing shows that gas-phase oxygenated organic molecules (OOMs) exhibit clear seasonal variations, with the highest concentrations in summer and the lowest in winter. Nitrogen-containing OOMs make up a significant fraction of the total growth rate, but their slightly higher volatility results in a lower contribution to particle growth.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2021)

Article Engineering, Chemical

An indicator for sulfuric acid-amine nucleation in atmospheric environments

Runlong Cai et al.

Summary: This study proposes an indicator for the occurrence of new particle formation (NPF) in the atmosphere based on the mechanism of H2SO4-amine nucleation. Long-term measurements in urban Beijing validate this indicator, showing good consistency with the occurrence of NPF. The indicator was also found to be applicable in urban Shanghai.

AEROSOL SCIENCE AND TECHNOLOGY (2021)

Article Engineering, Environmental

Acid-Base Clusters during Atmospheric New Particle Formation in Urban Beijing

Rujing Yin et al.

Summary: Molecular clustering is the initial step of atmospheric new particle formation, generating numerous secondary particles. Ion clusters were found to contain mixed clusters of sulfuric acid and amine, while only sulfuric acid clusters and sulfuric acid-amine clusters were observed in the neutral form. Oxygenated organic molecule clusters charged by nitrate and bisulfate ions were observed in ion clusters and were not correlated with the occurrence of sub-3 nm particles.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2021)

Article Environmental Sciences

The driving factors of new particle formation and growth in the polluted boundary layer

Mao Xiao et al.

Summary: NPF is a significant source of atmospheric particles, with rates in polluted boundary layer driven by the formation of sulfuric acid-base clusters stabilized by amines, high ammonia concentrations, and lower temperatures. Aromatic oxidation products play a minor role in NPF in urban environments, but are important for particle growth and survival of newly formed particles. The study provides quantitative information on NPF in diverse urban environments and helps interpret future ambient observations in polluted atmospheres.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2021)

Article Chemistry, Physical

Formation and growth of sub-3 nm particles in megacities: impact of background aerosols

Chenjuan Deng et al.

Summary: In urban Beijing, background aerosols play a crucial role in governing the condensation sink and new particle formation. The high loss rate and relatively low growth rate of particles due to strong scavenging by background aerosols result in a low survival rate of newly formed particles.

FARADAY DISCUSSIONS (2021)

Article Chemistry, Physical

Is reducing new particle formation a plausible solution to mitigate particulate air pollution in Beijing and other Chinese megacities?

Markku Kulmala et al.

Summary: Atmospheric gas-to-particle conversion plays a crucial role in haze formation in Chinese megacities, with over 65% of haze particles resulting from new particle formation. Reducing the subsequent growth rate of newly formed particles can delay haze episodes and improve air quality.

FARADAY DISCUSSIONS (2021)

Article Environmental Sciences

Measurement report: The influence of traffic and new particle formation on the size distribution of 1-800 nm particles in Helsinki - a street canyon and an urban background station comparison

Magdalena Okuljar et al.

Summary: This study investigated aerosol particle number concentrations in Helsinki, Finland, revealing differences in particle sources in different modes. Sub-3 nm and nucleation mode particles were linked to local sources like traffic, while accumulation mode particles were more influenced by non-local sources. These findings can help estimate traffic contribution to particle number concentrations in urban environments.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2021)

Article Environmental Sciences

Emerging Investigator Series: COVID-19 lockdown effects on aerosol particle size distributions in northern Italy

Jiali Shen et al.

Summary: Lockdown measures in Italy significantly reduced human activity and traffic intensity, resulting in decreased concentrations of nitrogen dioxide, nitric oxide, benzene, and toluene, while ozone concentrations slightly increased. However, particulate matter mass concentrations showed no significant changes. New particle formation frequency increased in urban areas during lockdown, but remained stable in regional background sites.

ENVIRONMENTAL SCIENCE-ATMOSPHERES (2021)

Article Environmental Sciences

Modeling the effect of reduced traffic due to COVID-19 measures on air quality using a chemical transport model: impacts on the Po Valley and the Swiss Plateau regions

Giancarlo Ciarelli et al.

Summary: The COVID-19 pandemic has created serious challenges for global communities, leading to various lockdown measures imposed by governments. Research in northern Italy and Switzerland found that these lockdown measures significantly reduced nitrogen dioxide and fine particulate matter concentrations, highlighting the importance of different emission categories in affecting air quality levels. Additionally, the study showed a mild increase in secondary organic aerosol concentrations due to an increase in the oxidation capacity of the atmosphere.

ENVIRONMENTAL SCIENCE-ATMOSPHERES (2021)

Article Environmental Sciences

Enhancement of nanoparticle formation and growth during the COVID-19 lockdown period in urban Beijing

Xiaojing Shen et al.

Summary: The primary emissions of particles and precursors in China significantly decreased during the COVID-19 lockdown period, but accumulation mode particles increased due to secondary aerosol formation. Enhanced new particle formation events, higher concentration of condensing vapors, and decreased condensation sink led to an increase in nanoparticle number concentration during the pandemic.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2021)

Article Environmental Sciences

Sulfuric acid-amine nucleation in urban Beijing

Runlong Cai et al.

Summary: Based on long-term atmospheric measurements in Beijing, it was found that the collision of H2SO4-amine clusters is the dominant mechanism for initiating NPF in urban environments, while high aerosol concentration limits the rate of new particle formation. Additionally, in Beijing, the formation of H2SO4-amine clusters is sometimes restricted by low amine concentrations.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2021)

Article Multidisciplinary Sciences

Remarkable nucleation and growth of ultrafine particles from vehicular exhaust

Song Guo et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2020)

Letter Environmental Sciences

Drop in urban air pollution from COVID-19 pandemic: Policy implications for the megacity of Sao Paulo

Patricia Krecl et al.

ENVIRONMENTAL POLLUTION (2020)

Article Geosciences, Multidisciplinary

The Response in Air Quality to the Reduction of Chinese Economic Activities During the COVID-19 Outbreak

Xiaoqin Shi et al.

GEOPHYSICAL RESEARCH LETTERS (2020)

Article Multidisciplinary Sciences

Size-dependent influence of NOx on the growth rates of organic aerosol particles

C. Yan et al.

SCIENCE ADVANCES (2020)

Article Multidisciplinary Sciences

Rapid growth of new atmospheric particles by nitric acid and ammonia condensation

Mingyi Wang et al.

NATURE (2020)

Article Engineering, Environmental

Seasonal Characteristics of New Particle Formation and Growth in Urban Beijing

Chenjuan Deng et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2020)

Article Engineering, Environmental

Severe air pollution events not avoided by reduced anthropogenic activities during COVID-19 outbreak

Pengfei Wang et al.

RESOURCES CONSERVATION AND RECYCLING (2020)

Article Environmental Sciences

Does lockdown reduce air pollution? Evidence from 44 cities in northern China

Rui Bao et al.

SCIENCE OF THE TOTAL ENVIRONMENT (2020)

Article Environmental Sciences

Comparative study on air quality status in Indian and Chinese cities before and during the COVID-19 lockdown period

Aviral Agarwal et al.

AIR QUALITY ATMOSPHERE AND HEALTH (2020)

Article Environmental Sciences

Ampli fied ozone pollution in cities during the COVID-19 lockdown

Pierre Sicard et al.

SCIENCE OF THE TOTAL ENVIRONMENT (2020)

Article Environmental Sciences

Response of major air pollutants to COVID-19 lockdowns in China

Zhipeng Pei et al.

SCIENCE OF THE TOTAL ENVIRONMENT (2020)

Article Environmental Sciences

Multi-generation OH oxidation as a source for highly oxygenated organic molecules from aromatics

Olga Garmash et al.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2020)

Article Environmental Sciences

Enhanced growth rate of atmospheric particles from sulfuric acid

Dominik Stolzenburg et al.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2020)

Article Multidisciplinary Sciences

Atmospheric autoxidation is increasingly important in urban and suburban North America

Eric Praske et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2018)

Article Multidisciplinary Sciences

Rapid growth of organic aerosol nanoparticles over a wide tropospheric temperature range

Dominik Stolzenburg et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2018)

Article Environmental Sciences

Formation of highly oxygenated organic molecules from aromatic compounds

Ugo Molteni et al.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2018)

Article Engineering, Environmental

Formation of Highly Oxidized Radicals and Multifunctional Products from the Atmospheric Oxidation of Alkylbenzenes

Sainan Wang et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2017)

Article Chemistry, Physical

Atmospheric gas-to-particle conversion: why NPF events are observed in megacities?

M. Kulmala et al.

FARADAY DISCUSSIONS (2017)

Article Multidisciplinary Sciences

Traffic is a major source of atmospheric nanocluster aerosol

Topi Ronkko et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2017)

Article Multidisciplinary Sciences

Reducing secondary organic aerosol formation from gasoline vehicle exhaust

Yunliang Zhao et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2017)

Article Chemistry, Physical

Atmospheric gas-to-particle conversion: why NPF events are observed in megacities?

M. Kulmala et al.

FARADAY DISCUSSIONS (2017)

Article Environmental Sciences

Aerosol surface area concentration: a governing factor in new particle formation in Beijing

Runlong Cai et al.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2017)

Article Environmental Sciences

A new balance formula to estimate new particle formation rate: reevaluating the effect of coagulation scavenging

Runlong Cai et al.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2017)

Article Multidisciplinary Sciences

The role of low-volatility organic compounds in initial particle growth in the atmosphere

Jasmin Troestl et al.

NATURE (2016)

Article Meteorology & Atmospheric Sciences

Characterization of the mass-dependent transmission efficiency of a CIMS

Martin Heinritzi et al.

ATMOSPHERIC MEASUREMENT TECHNIQUES (2016)

Article Multidisciplinary Sciences

A large source of low-volatility secondary organic aerosol

Mikael Ehn et al.

NATURE (2014)

Article Multidisciplinary Sciences

Neutral molecular cluster formation of sulfuric acid-dimethylamine observed in real time under atmospheric conditions

Andreas Kuerten et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2014)

Article Multidisciplinary Sciences

Elucidating severe urban haze formation in China

Song Guo et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2014)

Article Multidisciplinary Sciences

Molecular understanding of sulphuric acid-amine particle nucleation in the atmosphere

Joao Almeida et al.

NATURE (2013)

Article Chemistry, Physical

Calibration of a Chemical Ionization Mass Spectrometer for the Measurement of Gaseous Sulfuric Acid

Andreas Kuerten et al.

JOURNAL OF PHYSICAL CHEMISTRY A (2012)

Article Biochemical Research Methods

Measurement of the nucleation of atmospheric aerosol particles

Markku Kulmala et al.

NATURE PROTOCOLS (2012)

Article Environmental Sciences

Size distribution of airborne particles controls outcome of epidemiological studies

Roy M. Harrison et al.

SCIENCE OF THE TOTAL ENVIRONMENT (2010)

Article Environmental Sciences

Sub-10 nm particle growth by vapor condensation - effects of vapor molecule size and particle thermal speed

T. Nieminen et al.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2010)