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DOI	10.1016/j.atmosenv.2020.118035
	The effect of cold-start emissions on the diurnal variation of carbon monoxide concentration in a city centre
	Jayaratne R.; Thai P.; Christensen B.; Liu X.; Zing I.; Lamont R.; Dunbabin M.; Dawkins L.; Bertrand L.; Morawska L.
发表日期	2021
ISSN	1352-2310
卷号	245
英文摘要	The diurnal variation of pollutants such as particles and carbon monoxide (CO) in urban environments typically follow the traffic density, with two peaks coinciding with the weekday morning and evening rush-hour periods. However, observations made in central Brisbane, the third largest city in Australia, demonstrated an anomalous diurnal variation with the CO peak in the evening being significantly higher than that in the morning. This imbalance was not observed for particle concentrations. Here, we show that the imbalance is a direct result of the difference in CO emission factors from motor vehicles during warm and cold starts. Over 30,000 cars with warmed-up engines enter Brisbane city centre car parks every weekday morning. They all start their engines from cold and leave the city in the evening, producing the anomalously higher emissions of CO in the city centre. This pattern of air quality, while clearly apparent within the city car parks and within the central business district of the city, was not observed outside the city limits and in the suburbs. To the best of our knowledge, no previous study has drawn attention to this phenomenon and no explanation has been provided in the literature to-date. © 2020
关键词	Carbon monoxide Particle pollution PM2.5 Urban air quality Vehicle emissions
语种	英语
scopus关键词	Air quality; Engines; Garages (parking); Brisbane cities; Carbon monoxide concentration; Central business districts; Diurnal variation; Motor vehicle; Particle concentrations; Traffic densities; Urban environments; Carbon monoxide; carbon monoxide; air quality; carbon monoxide; central business district; concentration (composition); diurnal variation; emission; urban area; urban pollution; air quality; Article; Australia; circadian rhythm; city; cold; combustion; motor vehicle; particulate matter 2.5; priority journal; traffic; urban area; Australia; Brisbane; Queensland
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248748
作者单位	International Laboratory for Air Quality and Health, Queensland University of Technology, GPO Box 2434, Brisbane, QLD 4001, Australia; Institute for Future Environments, Queensland University of Technology, GPO Box 2434, Brisbane, QLD 4001, Australia; Queensland Alliance for Environmental Health Sciences, University of Queensland, Brisbane, QLD 4102, Australia; Meteorological Office, Exeter, Devon EX1 3PB, United Kingdom; Centro de Investigaciones en Bioquímica Clínica e Inmunología - CIBICI, Facultad de Ciencias Químicas, CONICET, UNC, Haya de La Torre Esq. Medina Allende, Córdoba, 5000, Argentina
推荐引用方式 GB/T 7714	Jayaratne R.,Thai P.,Christensen B.,et al. The effect of cold-start emissions on the diurnal variation of carbon monoxide concentration in a city centre[J],2021,245.
APA	Jayaratne R..,Thai P..,Christensen B..,Liu X..,Zing I..,...&Morawska L..(2021).The effect of cold-start emissions on the diurnal variation of carbon monoxide concentration in a city centre.ATMOSPHERIC ENVIRONMENT,245.
MLA	Jayaratne R.,et al."The effect of cold-start emissions on the diurnal variation of carbon monoxide concentration in a city centre".ATMOSPHERIC ENVIRONMENT 245(2021).