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UK surface NO2 levels dropped by 42 % during the COVID-19 lockdown: Impact on surface O3

Research output: Contribution to journal › Article › peer-review

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UK surface NO2 levels dropped by 42 % during the COVID-19 lockdown : Impact on surface O3. / Lee, James D.; Drysdale, Will S.; Finch, Doug P.; Wilde, Shona E.; Palmer, Paul I.

In: Atmospheric Chemistry and Physics, Vol. 20, No. 24, 18.12.2020, p. 15743-15759.

Research output: Contribution to journal › Article › peer-review

Harvard

Lee, JD, Drysdale, WS, Finch, DP, Wilde, SE & Palmer, PI 2020, 'UK surface NO2 levels dropped by 42 % during the COVID-19 lockdown: Impact on surface O3', Atmospheric Chemistry and Physics, vol. 20, no. 24, pp. 15743-15759. https://doi.org/10.5194/acp-20-15743-2020

APA

Lee, J. D., Drysdale, W. S., Finch, D. P., Wilde, S. E., & Palmer, P. I. (2020). UK surface NO2 levels dropped by 42 % during the COVID-19 lockdown: Impact on surface O3. Atmospheric Chemistry and Physics, 20(24), 15743-15759. https://doi.org/10.5194/acp-20-15743-2020

Vancouver

Lee JD, Drysdale WS, Finch DP, Wilde SE, Palmer PI. UK surface NO2 levels dropped by 42 % during the COVID-19 lockdown: Impact on surface O3. Atmospheric Chemistry and Physics. 2020 Dec 18;20(24):15743-15759. https://doi.org/10.5194/acp-20-15743-2020

Author

Lee, James D. ; Drysdale, Will S. ; Finch, Doug P. ; Wilde, Shona E. ; Palmer, Paul I. / UK surface NO2 levels dropped by 42 % during the COVID-19 lockdown : Impact on surface O3. In: Atmospheric Chemistry and Physics. 2020 ; Vol. 20, No. 24. pp. 15743-15759.

Bibtex - Download

@article{0795380c187d48d0b77a99d74c4eb814,
title = "UK surface NO2 levels dropped by 42 % during the COVID-19 lockdown: Impact on surface O3",
abstract = "We report changes in surface nitrogen dioxide (NO2) across the UK during the COVID-19 pandemic when large and rapid emission reductions accompanied a nationwide lockdown (23 March-31 May 2020, inclusively), and compare them with values from an equivalent period over the previous 5 years. Data are from the Automatic Urban and Rural Network (AURN), which forms the basis of checking nationwide compliance with ambient air quality directives. We calculate that NO2 reduced by 42 %±9.8 % on average across all 126 urban AURN sites, with a slightly larger (48 %±9.5 %) reduction at sites close to the roadside (urban traffic). We also find that ozone (O3) increased by 11 % on average across the urban background network during the lockdown period. Total oxidant levels (OxCombining double low lineNO2+O3) increased only slightly on average (3.2 %±0.2 %), suggesting the majority of this change can be attributed to photochemical repartitioning due to the reduction in NOx. Generally, we find larger, positive Ox changes in southern UK cities, which we attribute to increased UV radiation and temperature in 2020 compared to previous years. The net effect of the NO2 and O3 changes is a sharp decrease in exceedances of the NO2 air quality objective limit for the UK, with only one exceedance in London in 2020 up until the end of May. Concurrent increases in O3 exceedances in London emphasize the potential for O3 to become an air pollutant of concern as NOx emissions are reduced in the next 10-20 years..",
author = "Lee, {James D.} and Drysdale, {Will S.} and Finch, {Doug P.} and Wilde, {Shona E.} and Palmer, {Paul I.}",
note = "{\textcopyright} Author(s) 2020.",
year = "2020",
month = dec,
day = "18",
doi = "10.5194/acp-20-15743-2020",
language = "English",
volume = "20",
pages = "15743--15759",
journal = "Atmospheric Chemistry and Physics",
issn = "1680-7316",
publisher = "Copernicus Publications",
number = "24",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - UK surface NO2 levels dropped by 42 % during the COVID-19 lockdown

T2 - Impact on surface O3

AU - Lee, James D.

AU - Drysdale, Will S.

AU - Finch, Doug P.

AU - Wilde, Shona E.

AU - Palmer, Paul I.

N1 - © Author(s) 2020.

PY - 2020/12/18

Y1 - 2020/12/18

N2 - We report changes in surface nitrogen dioxide (NO2) across the UK during the COVID-19 pandemic when large and rapid emission reductions accompanied a nationwide lockdown (23 March-31 May 2020, inclusively), and compare them with values from an equivalent period over the previous 5 years. Data are from the Automatic Urban and Rural Network (AURN), which forms the basis of checking nationwide compliance with ambient air quality directives. We calculate that NO2 reduced by 42 %±9.8 % on average across all 126 urban AURN sites, with a slightly larger (48 %±9.5 %) reduction at sites close to the roadside (urban traffic). We also find that ozone (O3) increased by 11 % on average across the urban background network during the lockdown period. Total oxidant levels (OxCombining double low lineNO2+O3) increased only slightly on average (3.2 %±0.2 %), suggesting the majority of this change can be attributed to photochemical repartitioning due to the reduction in NOx. Generally, we find larger, positive Ox changes in southern UK cities, which we attribute to increased UV radiation and temperature in 2020 compared to previous years. The net effect of the NO2 and O3 changes is a sharp decrease in exceedances of the NO2 air quality objective limit for the UK, with only one exceedance in London in 2020 up until the end of May. Concurrent increases in O3 exceedances in London emphasize the potential for O3 to become an air pollutant of concern as NOx emissions are reduced in the next 10-20 years..

AB - We report changes in surface nitrogen dioxide (NO2) across the UK during the COVID-19 pandemic when large and rapid emission reductions accompanied a nationwide lockdown (23 March-31 May 2020, inclusively), and compare them with values from an equivalent period over the previous 5 years. Data are from the Automatic Urban and Rural Network (AURN), which forms the basis of checking nationwide compliance with ambient air quality directives. We calculate that NO2 reduced by 42 %±9.8 % on average across all 126 urban AURN sites, with a slightly larger (48 %±9.5 %) reduction at sites close to the roadside (urban traffic). We also find that ozone (O3) increased by 11 % on average across the urban background network during the lockdown period. Total oxidant levels (OxCombining double low lineNO2+O3) increased only slightly on average (3.2 %±0.2 %), suggesting the majority of this change can be attributed to photochemical repartitioning due to the reduction in NOx. Generally, we find larger, positive Ox changes in southern UK cities, which we attribute to increased UV radiation and temperature in 2020 compared to previous years. The net effect of the NO2 and O3 changes is a sharp decrease in exceedances of the NO2 air quality objective limit for the UK, with only one exceedance in London in 2020 up until the end of May. Concurrent increases in O3 exceedances in London emphasize the potential for O3 to become an air pollutant of concern as NOx emissions are reduced in the next 10-20 years..

UR - http://www.scopus.com/inward/record.url?scp=85098088935&partnerID=8YFLogxK

U2 - 10.5194/acp-20-15743-2020

DO - 10.5194/acp-20-15743-2020

M3 - Article

AN - SCOPUS:85098088935

VL - 20

SP - 15743

EP - 15759

JO - Atmospheric Chemistry and Physics

JF - Atmospheric Chemistry and Physics

SN - 1680-7316

IS - 24

ER -

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