Aqueous-phase chloramine production as a missing chain in atmospheric chlorine chemistry DOI Creative Commons
Jingkun Jiang, Yijing Chen, Men Xia

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 16, 2024

Abstract Chlorine radical (Cl·) profoundly impacts atmospheric oxidation capacity, and therefore climate change air pollution. Chloramines, especially trichloramine (NCl3), is a potentially important Cl· source, while their formation mechanism remains elusive. Here, we present evidence of aerosol aqueous-phase production chloramines with observations in Beijing develop comprehensive box model which incorporates ~40 aqueous reactions initiated by Cl2 NH3 multiple phase transfer processes. The can well reproduce the diurnal variation NCl3. We show that this could be ubiquitous globally co-existence water, Cl2, NH3, NCl3 mainly influenced relative humidity as typically great excess. contribution (mostly NCl3) to much higher clean periods (up 85%) than polluted (~5%) Beijing, environments (e.g., ~64% Canada) areas ~1% India). Therefore, play an increasingly role cleaner future may partially offset on-going efforts on pollution mitigation. missing representation current models significantly underestimate climate, health ecological Cl·.

Language: Английский

Atmospheric reactive nitrogen conversion kicks off the co-directional and contra-directional effects on PM2.5-O3 pollution DOI
Feng Wang,

Chun Zhang,

Yi Ge

et al.

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 478, P. 135558 - 135558

Published: Aug. 16, 2024

Language: Английский

Citations

1
Insights into the sources of ultrafine particle numbers at six European urban sites obtained by investigating COVID-19 lockdowns DOI Creative Commons
Alex Rowell, James Brean, David C. S. Beddows

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(16), P. 9515 - 9531

Published: Aug. 29, 2024

Abstract. Lockdown restrictions in response to the COVID-19 pandemic led curtailment of many activities and reduced emissions primary air pollutants. Here, we applied positive matrix factorisation particle size distribution (PSD) data from six monitoring sites (three urban background three roadside) between four European cities (Helsinki, Leipzig, Budapest, London) evaluate how number concentrations (PNCs) their sources changed during respective 2020 lockdown periods compared reference years 2014–2019. A common factors were resolved sites, including nucleation, road traffic semi-volatile fraction (road trafficsvf), solid trafficsf), diffuse (wood smoke + aged traffic), ozone-associated secondary aerosol (O3-associated SA), inorganic (SIA). Nucleation, traffic, largest contributors mean PNCs periods. However, SIA mass concentrations, irrespective environment type. Total lower at two urban-background all roadside lockdown. The nucleation trafficsvf was highly variable, although trafficsf consistently sites. responses largely consistent mostly Secondary aerosols SA SIA) exhibited extensive reductions These variegated lockdowns across Europe point a complex network sinks contributing PSDs.

Language: Английский

Citations

1
Dual isotope analysis reveals the COVID-19 lockdown impact on nitrate aerosol sources and formation pathways in Shanghai DOI
Rong Wang, Hao Xiao, Yu Xu

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 952, P. 175839 - 175839

Published: Aug. 30, 2024

Language: Английский

Citations

1
Insights into the sources of ultrafine particle numbers at six European urban sites obtained by investigating COVID–19 lockdowns DOI Creative Commons
Alex Rowell, James Brean, David C. S. Beddows

et al.

Published: Jan. 23, 2024

Abstract. Lockdown restrictions in response to the COVID–19 pandemic led curtailment of many activities and reduced emissions primary air pollutants. Here, we applied Positive Matrix Factorization particle size distribution (PSD) data from six monitoring sites (three urban background three roadside) between four European cities (Helsinki, Leipzig, Budapest, London) evaluate how number concentrations (PNCs) their sources changed during respective 2020 lockdown periods compared reference years 2014–2019. A common factors were resolved sites, including nucleation, road traffic semi–volatile fraction (road trafficsvf), solid trafficsf), diffuse (woodsmoke + aged traffic), ozone–associated secondary aerosol (O3–associated SA), inorganic (SIA). Nucleation, traffic, largest contributors mean PNCs periods. However, SIA mass concentrations, irrespective environment type. Total lower at two all roadside lockdown. Nucleation trafficsvf highly variable, although trafficsf consistently sites. The responses largely consistent mostly Secondary aerosols (O3-associated SA SIA) exhibited extensive reductions These variegated lockdowns across Europe point a complex network sinks contributing PSDs.

Language: Английский

Citations

0
Aqueous-phase chloramine production as a missing chain in atmospheric chlorine chemistry DOI Creative Commons
Jingkun Jiang, Yijing Chen, Men Xia

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 16, 2024

Abstract Chlorine radical (Cl·) profoundly impacts atmospheric oxidation capacity, and therefore climate change air pollution. Chloramines, especially trichloramine (NCl3), is a potentially important Cl· source, while their formation mechanism remains elusive. Here, we present evidence of aerosol aqueous-phase production chloramines with observations in Beijing develop comprehensive box model which incorporates ~40 aqueous reactions initiated by Cl2 NH3 multiple phase transfer processes. The can well reproduce the diurnal variation NCl3. We show that this could be ubiquitous globally co-existence water, Cl2, NH3, NCl3 mainly influenced relative humidity as typically great excess. contribution (mostly NCl3) to much higher clean periods (up 85%) than polluted (~5%) Beijing, environments (e.g., ~64% Canada) areas ~1% India). Therefore, play an increasingly role cleaner future may partially offset on-going efforts on pollution mitigation. missing representation current models significantly underestimate climate, health ecological Cl·.

Language: Английский

Citations

0