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Wang M, Duan Y, Zhang Z, Huo J, Huang Y, Fu Q, Wang T, Cao J, Lee SC. Increased contribution to PM 2.5 from traffic-influenced road dust in Shanghai over recent years and predictable future. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 313:120119. [PMID: 36122659 DOI: 10.1016/j.envpol.2022.120119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 08/25/2022] [Accepted: 09/02/2022] [Indexed: 06/15/2023]
Abstract
Traffic contributes to fine particulate matter (PM2.5) in the atmosphere through engine exhaust emissions and road dust generation. However, the evolution of traffic related PM2.5 emission over recent years remains unclear, especially when various efforts to reduce emission e.g., aftertreatment technologies and high emission standards from China IV to China V, have been implemented. In this study, hourly elemental carbon (EC), a marker of primary engine exhaust emissions, and trace element of calcium (Ca), a marker of road dust, were measured at a nearby highway sampling site in Shanghai from 2016 to 2019. A random forest-based machine learning algorithm was applied to decouple the influences of meteorological variables on the measured EC and Ca, revealing the deweathered trend in exhaust emissions and road dust. After meteorological normalization, we showed that non-exhaust emissions, i.e., road dust from traffic, increased their fractional contribution to PM2.5 over recent years. In particular, road dust was found to be more important, as revealed by the deweathered trend of Ca fraction in PM2.5, increasing at 6.1% year-1, more than twice that of EC (2.9% year-1). This study suggests that while various efforts have been successful in reducing vehicular exhaust emissions, road dust will not abate at a similar rate. The results of this study provide insights into the trend of traffic-related emissions over recent years based on high temporal resolution monitoring data, with important implications for policymaking.
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Affiliation(s)
- Meng Wang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR, China
| | - Yusen Duan
- Shanghai Environmental Monitoring Center, Shanghai, China
| | - Zhuozhi Zhang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR, China
| | - Juntao Huo
- Shanghai Environmental Monitoring Center, Shanghai, China
| | - Yu Huang
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
| | - Qingyan Fu
- Shanghai Environmental Monitoring Center, Shanghai, China
| | - Tao Wang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR, China
| | - Junji Cao
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China; Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
| | - Shun-Cheng Lee
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR, China.
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An Investigation into Which Methods Best Explain Children’s Exposure to Traffic-Related Air Pollution. TOXICS 2022; 10:toxics10060284. [PMID: 35736893 PMCID: PMC9229918 DOI: 10.3390/toxics10060284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 05/24/2022] [Accepted: 05/24/2022] [Indexed: 11/16/2022]
Abstract
There have been several methods employed to quantify individual-level exposure to ambient traffic-related air pollutants (TRAP). These include an individual’s residential proximity to roads, measurement of individual pollutants as surrogates or markers, as well as dispersion and land use regression (LUR) models. Hopanes are organic compounds still commonly found on ambient particulate matter and are specific markers of combustion engine primary emissions, but they have not been previously used in personal exposure studies. In this paper, children’s personal exposures to TRAP were evaluated using hopanes determined from weekly integrated filters collected as part of a personal exposure study in Windsor, Canada. These hopane measurements were used to evaluate how well other commonly used proxies of exposure to TRAP performed. Several of the LUR exposure estimates for a range of air pollutants were associated with the children’s summer personal hopane exposures (r = 0.41–0.74). However, all personal hopane exposures in summer were more strongly associated with the length of major roadways within 500 m of their homes. In contrast, metrics of major roadways and LUR estimates were poorly correlated with any winter personal hopanes. Our findings suggest that available TRAP exposure indicators have the potential for exposure misclassification in winter vs. summer and more so for LUR than for metrics of major road density. As such, limitations are evident when using traditional proxy methods for assigning traffic exposures and these may be especially important when attempting to assign exposures for children’s key growth and developmental windows. If long-term chronic exposures are being estimated, our data suggest that measures of major road lengths in proximity to homes are a more-specific approach for assigning personal TRAP exposures.
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Sly PD, Cormier SA, Lomnicki S, Harding JN, Grimwood K. Environmentally Persistent Free Radicals: Linking Air Pollution and Poor Respiratory Health? Am J Respir Crit Care Med 2020; 200:1062-1063. [PMID: 31237999 DOI: 10.1164/rccm.201903-0675le] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Affiliation(s)
| | - Stephania A Cormier
- University of QueenslandBrisbane, Australia.,Louisiana State UniversityBaton Rouge, Louisianaand
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Takaro TK, Scott JA, Allen RW, Anand SS, Becker AB, Befus AD, Brauer M, Duncan J, Lefebvre DL, Lou W, Mandhane PJ, McLean KE, Miller G, Sbihi H, Shu H, Subbarao P, Turvey SE, Wheeler AJ, Zeng L, Sears MR, Brook JR. The Canadian Healthy Infant Longitudinal Development (CHILD) birth cohort study: assessment of environmental exposures. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2015; 25:580-92. [PMID: 25805254 PMCID: PMC4611361 DOI: 10.1038/jes.2015.7] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Accepted: 12/15/2014] [Indexed: 05/23/2023]
Abstract
The Canadian Healthy Infant Longitudinal Development birth cohort was designed to elucidate interactions between environment and genetics underlying development of asthma and allergy. Over 3600 pregnant mothers were recruited from the general population in four provinces with diverse environments. The child is followed to age 5 years, with prospective characterization of diverse exposures during this critical period. Key exposure domains include indoor and outdoor air pollutants, inhalation, ingestion and dermal uptake of chemicals, mold, dampness, biological allergens, pets and pests, housing structure, and living behavior, together with infections, nutrition, psychosocial environment, and medications. Assessments of early life exposures are focused on those linked to inflammatory responses driven by the acquired and innate immune systems. Mothers complete extensive environmental questionnaires including time-activity behavior at recruitment and when the child is 3, 6, 12, 24, 30, 36, 48, and 60 months old. House dust collected during a thorough home assessment at 3-4 months, and biological specimens obtained for multiple exposure-related measurements, are archived for analyses. Geo-locations of homes and daycares and land-use regression for estimating traffic-related air pollution complement time-activity-behavior data to provide comprehensive individual exposure profiles. Several analytical frameworks are proposed to address the many interacting exposure variables and potential issues of co-linearity in this complex data set.
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Affiliation(s)
- Tim K Takaro
- Simon Fraser University, Vancouver, British Columbia, Canada
| | | | - Ryan W Allen
- Simon Fraser University, Vancouver, British Columbia, Canada
| | | | | | - A Dean Befus
- University of Alberta, Edmonton, Alberta, Canada
| | - Michael Brauer
- University of British Columbia, Vancouver, British Columbia, Canada
| | | | | | - Wendy Lou
- University of Toronto, Toronto, Ontario, Canada
| | | | | | | | - Hind Sbihi
- University of British Columbia, Vancouver, British Columbia, Canada
| | - Huan Shu
- Simon Fraser University, Vancouver, British Columbia, Canada
- Karlstad University, Karlstad, Värmland, Sweden
| | - Padmaja Subbarao
- University of Toronto, Toronto, Ontario, Canada
- Hospital for Sick Children, Toronto, Ontario, Canada
| | - Stuart E Turvey
- University of British Columbia, Vancouver, British Columbia, Canada
| | - Amanda J Wheeler
- Edith Cowan University, Joondalup, Western Australia, Australia
- Health Canada, Ottawa, Ontario, Canada
| | - Leilei Zeng
- University of Waterloo, Waterloo, Ontario, Canada
| | | | - Jeffrey R Brook
- University of Toronto, Toronto, Ontario, Canada
- Environment Canada, Toronto, Ontario, Canada
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Cordioli M, Ranzi A, Freni Sterrantino A, Erspamer L, Razzini G, Ferrari U, Gatti MG, Bonora K, Artioli F, Goldoni CA, Lauriola P. A comparison between self-reported and GIS-based proxies of residential exposure to environmental pollution in a case-control study on lung cancer. Spat Spatiotemporal Epidemiol 2014; 9:37-45. [PMID: 24889992 DOI: 10.1016/j.sste.2014.04.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2013] [Revised: 03/03/2014] [Accepted: 04/25/2014] [Indexed: 01/09/2023]
Abstract
In epidemiological studies both questionnaire results and GIS modeling have been used to assess exposure to environmental risk factors. Nevertheless, few studies have used both these techniques to evaluate the degree of agreement between different exposure assessment methodologies. As part of a case-control study on lung cancer, we present a comparison between self-reported and GIS-derived proxies of residential exposure to environmental pollution. 649 subjects were asked to fill out a questionnaire and give information about residential history and perceived exposure. Using GIS, for each residence we evaluated land use patterns, proximity to major roads and exposure to industrial pollution. We then compared the GIS exposure-index values among groups created on the basis of questionnaire responses. Our results showed a relatively high agreement between the two methods. Although none of these methods is the "exposure gold standard", understanding similarities, weaknesses and strengths of each method is essential to strengthen epidemiological evidence.
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Affiliation(s)
- M Cordioli
- University of Parma, Department of Bio-Sciences, Parco Area delle Scienze 11/A, 43124 Parma, Italy; Environmental Health Reference Centre, Regional Agency for Environmental Prevention of Emilia-Romagna, Via Begarelli 13, 41121 Modena, Italy.
| | - A Ranzi
- Environmental Health Reference Centre, Regional Agency for Environmental Prevention of Emilia-Romagna, Via Begarelli 13, 41121 Modena, Italy.
| | - A Freni Sterrantino
- Environmental Health Reference Centre, Regional Agency for Environmental Prevention of Emilia-Romagna, Via Begarelli 13, 41121 Modena, Italy; University of Bologna, Department of Statistical Sciences, Via Belle Arti 41, Bologna, Italy.
| | - L Erspamer
- Environmental Health Reference Centre, Regional Agency for Environmental Prevention of Emilia-Romagna, Via Begarelli 13, 41121 Modena, Italy.
| | - G Razzini
- Clinical Trials Office, Cancer Unit of the Carpi General Hospital, Via Guido Molinari 2, Carpi, Modena, Italy.
| | - U Ferrari
- Clinical Trials Office, Cancer Unit of the Carpi General Hospital, Via Guido Molinari 2, Carpi, Modena, Italy.
| | - M G Gatti
- Department of Public Health, Unit of Epidemiology, Local Health Unit of Modena, Strada Martiniana 21, Baggiovara, 41126 Modena, Italy.
| | - K Bonora
- Department of Public Health, Unit of Epidemiology, Local Health Unit of Modena, Strada Martiniana 21, Baggiovara, 41126 Modena, Italy.
| | - F Artioli
- Clinical Trials Office, Cancer Unit of the Carpi General Hospital, Via Guido Molinari 2, Carpi, Modena, Italy.
| | - C A Goldoni
- Department of Public Health, Unit of Epidemiology, Local Health Unit of Modena, Strada Martiniana 21, Baggiovara, 41126 Modena, Italy.
| | - P Lauriola
- Environmental Health Reference Centre, Regional Agency for Environmental Prevention of Emilia-Romagna, Via Begarelli 13, 41121 Modena, Italy.
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