Ozone Initiates Human-Derived Emission of Nanocluster Aerosols
Artikel i vetenskaplig tidskrift, 2021
Nanocluster aerosols (NCAs, particles <3 nm) are important players in driving climate feedbacks and processes that impact human health. This study reports, for the first time, NCA formation when gas-phase ozone reacts with human surfaces. In an occupied climate-controlled chamber, we detected NCA only when ozone was present. NCA emissions were dependent on clothing coverage, occupant age, air temperature, and humidity. Ozone-initiated chemistry with human skin lipids (particularly their primary surface reaction products) is the key mechanism driving NCA emissions, as evidenced by positive correlations with squalene in human skin wipe samples and known gaseous products from ozonolysis of skin lipids. Oxidation by OH radicals, autoxidation reactions, and human-emitted NH3 may also play a role in NCA formation. Such chemical processes are anticipated to generate aerosols of the smallest size (1.18-1.55 nm), whereas larger clusters result from subsequent growth of the smaller aerosols. This study shows that whenever we encounter ozone indoors, where we spend most of our lives, NCAs will be produced in the air around us.
ozone chemistry
particle formation
indoor air
human skin lipids
molecular clusters
Författare
Shen Yang
Ecole Polytechnique Federale de Lausanne (EPFL)
Dusan Licina
Ecole Polytechnique Federale de Lausanne (EPFL)
Charles J. Weschler
Danmarks Tekniske Universitet (DTU)
Rutgers University
Nijing Wang
Max-Planck-Gesellschaft
Nora Zannoni
Max-Planck-Gesellschaft
Mengze Li
Max-Planck-Gesellschaft
Joonas Vanhanen
Airmodus Oy
Sarka Langer
IVL Svenska Miljöinstitutet
Chalmers, Arkitektur och samhällsbyggnadsteknik, Installationsteknik
Pawel Wargocki
Danmarks Tekniske Universitet (DTU)
Jonathan Williams
Max-Planck-Gesellschaft
Cyprus Institute
G. Beko
Danmarks Tekniske Universitet (DTU)
Environmental Science & Technology
0013-936X (ISSN) 1520-5851 (eISSN)
Vol. 55 21 14536-14545Ämneskategorier
Meteorologi och atmosfärforskning
Kemiska processer
Annan medicinsk grundvetenskap
DOI
10.1021/acs.est.1c03379
PubMed
34672572