TY - JOUR
T1 - Effects of emission sources on the particle number size distribution of ambient air in the residential area
AU - Harni, Sami D.
AU - Saarikoski, Sanna
AU - Kuula, Joel
AU - Helin, Aku
AU - Aurela, Minna
AU - Niemi, Jarkko V.
AU - Kousa, Anu
AU - Rönkkö, Topi
AU - Timonen, Hilkka
N1 - Funding Information:
Financial support from Black Carbon Footprint project funded by Business Finland (Grant 528/31/2019 ) and participating companies, from European Union Horizon 2020 research and innovation programme under grant agreement No 814978 (TUBE), and Grant agreement No 101036245 (RI-URBANS), and from European Regional Development Fund , Urban innovative actions initiative (HOPE; Healthy Outdoor Premises for Everyone, project nro: UIA03-240), Urban Air Quality 2.0 project funded by Technology Industries of Finland Centennial Foundation and by the Academy of Finland via the project Black and Brown Carbon in the Atmosphere and the Cryosphere (BBrCAC) (decision nr. 341271 ) is gratefully acknowledged. Support and training provided by COST Action CA16109 COLOSSAL and Academy of Finland Flagship funding (grant no. 337552 , 337551 ) are gratefully acknowledged. The authors gratefully acknowledge the NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model and/or READY website ( https://www.ready.noaa.gov ) used in this publication.
Funding Information:
Financial support from Black Carbon Footprint project funded by Business Finland (Grant 528/31/2019) and participating companies, from European Union Horizon 2020 research and innovation programme under grant agreement No 814978 (TUBE), and Grant agreement No 101036245 (RI-URBANS), and from European Regional Development Fund, Urban innovative actions initiative (HOPE; Healthy Outdoor Premises for Everyone, project nro: UIA03-240), Urban Air Quality 2.0 project funded by Technology Industries of Finland Centennial Foundation and by the Academy of Finland via the project Black and Brown Carbon in the Atmosphere and the Cryosphere (BBrCAC) (decision nr. 341271) is gratefully acknowledged. Support and training provided by COST Action CA16109 COLOSSAL and Academy of Finland Flagship funding (grant no. 337552, 337551) are gratefully acknowledged. The authors gratefully acknowledge the NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model and/or READY website (https://www.ready.noaa.gov) used in this publication.
Publisher Copyright:
© 2022 The Authors
PY - 2023/1/15
Y1 - 2023/1/15
N2 - Particle size distribution is a major factor in the health and climate effects of ambient aerosols, and it shows a large variation depending on the prevailing atmospheric emission sources. In this work, the particle number size distributions of ambient air were investigated at a suburban detached housing area in northern Helsinki, Finland, during a half-year period from winter to summer of 2020. The measurements were conducted with a scanning mobility particle sizer (SMPS) with a particle size range of 16–698 nm (mobility diameter), and the events with a dominant particle source were identified systematically from the data based on the time of the day and different particle physical and chemical properties. During the measurement period, four different types of events with a dominant contribution from either wood-burning (WB), traffic (TRA), secondary biogenic (BIO), or long-range transported (LRT) aerosol were observed. The particle size was the largest for the LRT events followed by BIO, WB, and TRA events with the geometric mean diameters of 72, 62, 57, and 41 nm, respectively. BIO and LRT produced the largest particle mode sizes followed by WB, and TRA with the modes of 69, 69, 46, and 25 nm, respectively. Each event type had also a noticeably different shape of the average number size distribution (NSD). In addition to the evaluation of NSDs representing different particle sources, also the effects of COVID-19 lockdown on specific aerosol properties were studied as during the measurement period the COVID-19 restrictions took place greatly reducing the traffic volumes in the Helsinki area in the spring of 2020. These restrictions had a significant contribution to reducing the concentrations of NOx and black carbon originating from fossil fuel combustion concentration, but insignificant effects on other studied variables such as number concentration and size distribution or particle mass concentrations (PM1, PM2.5, or PM10).
AB - Particle size distribution is a major factor in the health and climate effects of ambient aerosols, and it shows a large variation depending on the prevailing atmospheric emission sources. In this work, the particle number size distributions of ambient air were investigated at a suburban detached housing area in northern Helsinki, Finland, during a half-year period from winter to summer of 2020. The measurements were conducted with a scanning mobility particle sizer (SMPS) with a particle size range of 16–698 nm (mobility diameter), and the events with a dominant particle source were identified systematically from the data based on the time of the day and different particle physical and chemical properties. During the measurement period, four different types of events with a dominant contribution from either wood-burning (WB), traffic (TRA), secondary biogenic (BIO), or long-range transported (LRT) aerosol were observed. The particle size was the largest for the LRT events followed by BIO, WB, and TRA events with the geometric mean diameters of 72, 62, 57, and 41 nm, respectively. BIO and LRT produced the largest particle mode sizes followed by WB, and TRA with the modes of 69, 69, 46, and 25 nm, respectively. Each event type had also a noticeably different shape of the average number size distribution (NSD). In addition to the evaluation of NSDs representing different particle sources, also the effects of COVID-19 lockdown on specific aerosol properties were studied as during the measurement period the COVID-19 restrictions took place greatly reducing the traffic volumes in the Helsinki area in the spring of 2020. These restrictions had a significant contribution to reducing the concentrations of NOx and black carbon originating from fossil fuel combustion concentration, but insignificant effects on other studied variables such as number concentration and size distribution or particle mass concentrations (PM1, PM2.5, or PM10).
U2 - 10.1016/j.atmosenv.2022.119419
DO - 10.1016/j.atmosenv.2022.119419
M3 - Article
AN - SCOPUS:85140296924
SN - 1352-2310
VL - 293
JO - Atmospheric Environment
JF - Atmospheric Environment
M1 - 119419
ER -
