Ultrafine particles and PM2.5 in the air of cities around the world : Are they representative of each other?
- de Jesus, Alma Lorelei
- Rahman, Md Mahmudur
- Mazaheri, Mandana
- Thompson, Helen
- Knibbs, Luke D.
- Jeong, Cheol
- Evans, Greg
- Nei, Wei
- Ding, Aijun
- Qiao, Liping
- Li, Li
- Portin, Harri
- Niemi, Jarkko V.
- Timonen, Hilkka
- Luoma, Krista
- Petäjä, Tuukka
- Kulmala, Markku
- Kowalski, Michal
- Peters, Annette
- Cyrys, Josef
- Ferrero, Luca
- Manigrasso, Maurizio
- Avino, Pasquale
- Buonano, Giorgio
- Reche, Cristina
- Querol, Xavier
- Beddows, David
- Harrison, Roy M.
- Sowlat, Mohammad H.
- Sioutas, Constantinos
- Morawska, Lidia
DOIAbstract
Can mitigating only particle mass, as the existing air quality measures do, ultimately lead to reduction in ultrafine particles (UFP)? The aim of this study was to provide a broader urban perspective on the relationship between UFP, measured in terms of particle number concentration (PNC) and PM2.5 (mass concentration of particles with aerodynamic diameter 1 for roadside sites and <1 for urban background sites with lower values for more polluted cities. The Pearson's r ranged from 0.09 to 0.64 for the log-transformed data, indicating generally poor linear correlation between PNC and PM2.5. Therefore, PNC and PM2.5 measurements are not representative of each other; and regulating PM2.5 does little to reduce PNC. This highlights the need to ...
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