Road Traffic Emissions Lead to Much Enhanced New Particle Formation through Increased Growth Rates.

Autor:	Brean J; Division of Environmental Health and Risk Management, School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom., Rowell A; Division of Environmental Health and Risk Management, School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom., Beddows DCS; Division of Environmental Health and Risk Management, School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom., Weinhold K; Leibniz Institute for Tropospheric Research, Leipzig 04318, Germany., Mettke P; Leibniz Institute for Tropospheric Research, Leipzig 04318, Germany., Merkel M; Leibniz Institute for Tropospheric Research, Leipzig 04318, Germany., Tuch T; Leibniz Institute for Tropospheric Research, Leipzig 04318, Germany., Rissanen M; Aerosol Physics laboratory, Tampere University, Tampere 33720, Finland., Maso MD; Aerosol Physics laboratory, Tampere University, Tampere 33720, Finland., Kumar A; Aerosol Physics laboratory, Tampere University, Tampere 33720, Finland., Barua S; Aerosol Physics laboratory, Tampere University, Tampere 33720, Finland., Iyer S; Aerosol Physics laboratory, Tampere University, Tampere 33720, Finland., Karppinen A; Aerosol Physics laboratory, Tampere University, Tampere 33720, Finland., Wiedensohler A; Leibniz Institute for Tropospheric Research, Leipzig 04318, Germany., Shi Z; Division of Environmental Health and Risk Management, School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom., Harrison RM; Division of Environmental Health and Risk Management, School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom.; Department of Environmental Sciences, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
Jazyk:	angličtina
Zdroj:	Environmental science & technology [Environ Sci Technol] 2024 Jun 18; Vol. 58 (24), pp. 10664-10674. Date of Electronic Publication: 2024 Jun 08.
DOI:	10.1021/acs.est.3c10526
Abstrakt:	New particle formation (NPF) is a major source of atmospheric aerosol particles, including cloud condensation nuclei (CCN), by number globally. Previous research has highlighted that NPF is less frequent but more intense at roadsides compared to urban background. Here, we closely examine NPF at both background and roadside sites in urban Central Europe. We show that the concentration of oxygenated organic molecules (OOMs) is greater at the roadside, and the condensation of OOMs along with sulfuric acid onto new particles is sufficient to explain the growth at both sites. We identify a hitherto unreported traffic-related OOM source contributing 29% and 16% to total OOMs at the roadside and background, respectively. Critically, this hitherto undiscovered OOM source is an essential component of urban NPF. Without their contribution to growth rates and the subsequent enhancements to particle survival, the number of >50 nm particles produced by NPF would be reduced by a factor of 21 at the roadside site. Reductions to hydrocarbon emissions from road traffic may thereby reduce particle numbers and CCN counts.
Databáze:	MEDLINE
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