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- W4224290448 abstract "Abstract This study provides valuable insight into impacts of COVID-19 emergency public health “lockdown” measures upon traffic flow, active travel and gaseous pollutant concentrations (NO, NO 2 , and O 3 ) in Oxford city centre during 2020. Comparisons of traffic counts indicated pronounced changes in traffic volume associated with national lockdown periods. Car volume reduced by 77.5% (statistically significant) during the first national lockdown, with lesser changes in goods vehicles and public transport (bus) activity during the second lockdown. Cycle flow reduced substantively during the first lockdown only. These changes resulted in a reduction in nitric oxide (NO) and nitrogen dioxide (NO 2 ) concentrations of 75.1% and 47.4%, respectively at roadside, and 71.8% and 34.1% at urban background during the first lockdown period. In contrast ozone (O 3 ) concentrations increased at the urban background site by 22.3% during the first lockdown period, with no significant changes in gaseous concentrations during the second lockdown at either roadside or urban background location. The diurnal pattern of peak mean NO and NO 2 concentrations reduced in magnitude and was shifted approximately 2 hours earlier in the morning and 2 hours later in the evening (roadside) and 3 hours earlier in the morning and 3 hours later in the evening (urban background). Our findings provide an example of how gaseous air quality in urban environments could respond to future urban traffic restrictions, suggesting benefits from reductions in peak and daily NO 2 exposures may be offset by health harms arising from increases in ground level O 3 concentrations in the summer months." @default.
- W4224290448 created "2022-04-26" @default.
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- W4224290448 date "2022-04-19" @default.
- W4224290448 modified "2023-09-27" @default.
- W4224290448 title "Impacts of COVID-19 lockdown on traffic flow, active travel and gaseous pollutant concentrations; implications for future emissions control measures in Oxford, UK" @default.
- W4224290448 doi "https://doi.org/10.21203/rs.3.rs-1490381/v1" @default.
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