Changes in primary and secondary aerosols during a controlled Chinese New Year

Xu, Weiqi; Zhou, Wei; Li, Zhijie; Wang, Qingqing; Du, Aodong; You, Bo; Qi, Lü; Prévôt, Andrê S. H.; Cao, Junji; Wang, Zifa; Zhu, Jiang; Shrivastava, Manish

doi:10.1016/j.envpol.2022.120408

Cited by 4 publications

(3 citation statements)

References 46 publications

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“…The detailed information on the sampling site is presented in Li et al 27 The gym HR-AMS data were analyzed with ToF-AMS HR Analysis 1.26 software in Igor Pro. The mass concentrations of NR-PM 1 species were determined using the previously calibrated ionization efficiency, 28 relative ionization efficiencies, and composition dependent collection efficiency. 29 The sources of OA were determined through positive matrix factorization (PMF) analysis of high-resolution mass spectra ranging from m/z 12 to 150 30,31 following the procedures in Zhang et al 32 After evaluating the mass spectral profiles, temporal variations and correlations with tracer ions and species, and diurnal cycles, a 7-factor solution was chosen.…”

Section: Methodsmentioning

confidence: 99%

Particulate Siloxane and Cigarette Smoke Organic Aerosol in a Gym

Sun,

Li,

You

et al. 2024

Environ. Sci. Technol. Lett.

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Understanding the composition and concentration of pollutants in the gym environment is crucial for evaluating the potential health risks associated with physical exercise. Here submicron aerosol composition in a basement gym was characterized by a highresolution aerosol mass spectrometer. Our results showed higher fraction of organic aerosol (OA) in particulate matter indoors (50%) than outdoors (40%). Positive matrix factorization identified two distinct gym-related OA factors, i.e., siloxane OA (SiOA) and cigarette smoke OA (CSOA). Unexpectedly high concentrations of particulate siloxane, up to 6 μg m −3 and contributing 7−11% of OA were observed, and the variations of SiOA were strongly correlated with carbon dioxide emissions from human activities. The source of SiOA is likely from the lubricant of silicone polymers used in fitness equipment during exercise. Additionally, the presence of CSOA in the gym, on average contributing 6−7% of OA, is primarily linked to outdoor transport during ventilation. Our results highlight the significance of thorough investigations of air quality across different gyms with varying equipment, human occupancy, and ventilation conditions which is pivotal for implementing effective measures that ensure healthy indoor air quality and minimize potential health risks associated with exercise in gyms.

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Section: Methodsmentioning

confidence: 99%

Particulate Siloxane and Cigarette Smoke Organic Aerosol in a Gym

Sun,

Li,

You

et al. 2024

Environ. Sci. Technol. Lett.

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“…These sensors are favored by researchers because of their convenience and low cost. The use of sensors leads to higher spatial precision in monitoring, but the methods of component detection of particulates are still dominated by on-line aerosol mass spectrometry or off-line sampling plus laboratory testing [9][10][11][12]. Satellite remote sensing has also been used in air quality monitoring in recent years, as it can provide long-term observations with the advantages of wide spatial coverage and multi-element synchronous acquisition.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Source Apportionment of PM in Handan—A Case Study during the COVID-19

Shu

Wang

et al. 2023

Atmosphere

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Handan is a typical city affected by regional particulate pollution. In order to investigate particulate matter (PM) characterization, source contributions and health risks for the general populations, we collected PM samples at two sites affected by a pollution event (12–18 May 2020) during the COVID-19 pandemic and analyzed the major components (SNA, OCEC, WSIIs, and metal elements). A PCA-MLR model was used for source apportionment. The carcinogenic and non-carcinogenic risks caused by metal elements in the PM were assessed. The results show that the renewal of old neighborhoods significantly influences local PM, and primarily the PM10; the average contribution to PM10 was 27 μg/m3. The source apportionment has indicated that all other elements came from dust, except Cd, Pb and Zn, and the contribution of the dust source to PM was 60.4%. As PM2.5 grew to PM10, the PM changed from basic to acidic, resulting in a lower NH4+ concentration in PM10 than PM2.5. The carcinogenic risk of PM10 was more than 1 × 10−6 for both children and adults, and the excess mortality caused by the renewal of the community increased by 23%. Authorities should pay more attention to the impact of renewal on air quality. The backward trajectory and PSCF calculations show that both local sources and short-distance transport contribute to PM—local sources for PM10, and short-distance transport in southern Hebei, northern Henan and northern Anhui for PM2.5, SO2 and NO2.

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“…Yet despite large reductions of primary pollutant (e.g., NO 2 ) in China (Bauwens et al, 2020), there were still several haze episodes (Sun et al, 2020b;Huang et al, 2021). Besides the COVID lockdown, the emission reduction of anthropogenic activity (Zhang et al, 2015a;Yang et al, 2020), changes of aerosol composition (Kong et al, 2015;Zhao et al, 2017) and dominant role of secondary aerosol formation were also observed during the public holiday and anniversary (Lin et al, 2020;Sun et al, 2020b;Wang et al, 2021;Xu et al, 2022;Zhou et al, 2022b), which indicates that controlling local primary source emissions might have a limited effect on improving air quality in some megacities (Jiang et al, 2015). Hence, the weeklong CNY holiday can be considered as a similar condition with a nationwide emission reduction, providing us ideal experiments to explore the impacts of emission reduction on secondary aerosol formation.…”

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confidence: 99%

Response of organic aerosol characteristics to emission reduction in Yangtze River Delta region

Wang

Nie

et al. 2023

Front. Environ. Sci. Eng.

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Organic aerosol (OA) is a major component of atmospheric particulate matter (PM) with complex composition and formation processes influenced by various factors. Emission reduction can alter both precursors and oxidants which further affects secondary OA formation. Here we provide an observational analysis of secondary OA (SOA) variation properties in Yangtze River Delta (YRD) of eastern China in response to large scale of emission reduction during Chinese New Year (CNY) holidays from 2015 to 2020, and the COVID-19 pandemic period from January to March, 2020. We found a 17% increase of SOA proportion during the COVID lockdown. The relative enrichment of SOA is also found during multi-year CNY holidays with dramatic reduction of anthropogenic emissions. Two types of oxygenated OA (OOA) influenced by mixed emissions and SOA formation were found to be the dominant components during the lockdown in YRD region. Our results highlight that these emission-reduction-induced changes in organic aerosol need to be considered in the future to optimize air pollution control measures. Electronic Supplementary Material Supplementary material is available in the online version of this article at 10.1007/s11783-023-1714-0 and is accessible for authorized users.

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Changes in primary and secondary aerosols during a controlled Chinese New Year

Cited by 4 publications

References 46 publications

Particulate Siloxane and Cigarette Smoke Organic Aerosol in a Gym

Particulate Siloxane and Cigarette Smoke Organic Aerosol in a Gym

Characterization and Source Apportionment of PM in Handan—A Case Study during the COVID-19

Response of organic aerosol characteristics to emission reduction in Yangtze River Delta region

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