The relative contributions of traffic and non-traffic sources in ultrafine particle formations in Tehran mega city

Emissions of ultrafine particles (UFPs; diameter  10 nm at nine stations and understand the major sources of UFP s (primary vs. secondary) in Tehran megacity. The study was carried out in Tehran in 2020. NOx and PNC were reported from a total of nine urban site locations in Tehran and BC concentrati...

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Published in:Scientific reports 2024-05, Vol.14 (1), p.10399-12, Article 10399
Main Authors: Jafarigol, Farzaneh, Yousefi, Somayeh, Darvishi Omrani, Ali, Rashidi, Yousef, Buonanno, Giorgio, Stabile, Luca, Sabanov, Sergei, Amouei Torkmahalleh, Mehdi
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704/172
704/172/4081
Aerosols
Air pollution
Cities
Emissions
Epidemiology
Humanities and Social Sciences
Megacities
Mining engineering
multidisciplinary
Nitrogen dioxide
Outdoor air quality
Pollutants
Science
Science (multidisciplinary)
Trucks
Urban areas
Urban environments
Vehicle emissions
Vehicles
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creator Jafarigol, Farzaneh
Yousefi, Somayeh
Darvishi Omrani, Ali
Rashidi, Yousef
Buonanno, Giorgio
Stabile, Luca
Sabanov, Sergei
Amouei Torkmahalleh, Mehdi
description Emissions of ultrafine particles (UFPs; diameter  10 nm at nine stations and understand the major sources of UFP s (primary vs. secondary) in Tehran megacity. The study was carried out in Tehran in 2020. NOx and PNC were reported from a total of nine urban site locations in Tehran and BC concentrations were examined at two monitoring stations. Data from all stations showed diurnal changes with peak morning and evening rush hours. The hourly PNC was correlated with NOx. PNCs in Tehran were higher compared to those of many cities reported in the literature. The highest concentrations were at District 19 station (traffic) and the lowest was at Punak station (residential) such that the average PNC varied from 8.4 × 10 3 to 5.7 × 10 4 cm −3 . In Ray and Sharif stations, the average contributions of primary and secondary sources of PNC were 67 and 33%, respectively. Overall, we conclude that a decrease in primary emission leads to a decrease in the total concentration of aerosols, despite an increase in the formation of new particles by photo nucleation.
doi_str_mv 10.1038/s41598-023-49444-z
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subjects 704/172
704/172/4081
Aerosols
Air pollution
Cities
Emissions
Epidemiology
Humanities and Social Sciences
Megacities
Mining engineering
multidisciplinary
Nitrogen dioxide
Outdoor air quality
Pollutants
Science
Science (multidisciplinary)
Trucks
Urban areas
Urban environments
Vehicle emissions
Vehicles
title The relative contributions of traffic and non-traffic sources in ultrafine particle formations in Tehran mega city
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