@article{fdi:010087684,
  title = {{I}mpact of {COVID}-19 lockdown on particulate matter oxidative potential at urban background versus traffic sites},
  author = {{B}orlaza, {L}. {J}. {S}. and {T}huy, {V}. {D}. and {G}range, {S}. and {S}ocquet, {S}. and {M}oussu, {E}. and {M}ary, {G}. and {F}avez, {O}. and {H}ueglin, {C}. and {J}affrezo, {J}. {L}. and {U}zu, {G}a{\¨e}lle},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n {E}urope, {COVID}-19 lockdown restrictions were first implemented in {M}arch 2020 to control the spread of the disease from the {SARS}-{C}o{V}-2 virus. {M}any studies have focused on the influence of the applied measures on pollution levels during this period, but very limited information on the oxidative potential ({OP}), an emerging metric of particulate matter ({PM}) exposure. {F}urthermore, most previous studies also commonly used comparative methods with historical datasets, which may not be estimating the real pollution levels without the lockdown restrictions in place. {I}n this study, the {OP} of {PM} collected at urban background ({G}renoble, {F}rance) and traffic ({B}ern, {S}witzerland) sites was assessed using dithiothreitol ({DTT}) and ascorbic acid ({AA}) assays. {T}hese measurements were also compared with {PM} and black carbon ({BC}) mass concentrations, including the wood burning and fossil fuel fractions of {BC}. {T}o obtain a more realistic pollution level, assuming there were no lockdown restrictions in place, a machine learning technique called the {R}andom {F}orest ({RF}) regression model was applied to predict a business-as-usual ({BAU}) level for {OP}, {PM}, and {BC} in both sites. {T}his model provided a good estimate of the {BAU} levels, allowing a more realistic assessment of the pollution changes during the lockdown period. {T}he results indicate a clear decrease in {OP} found in the traffic site, while a more modest change in {OP} was found at the urban background site, likely due to sustained contributions from wood burning sources for residential heating. {O}verall, this study confirms the major roles of both of these combustion sources in the {OP} levels in ambient air.},
  keywords = {{FRANCE} ; {SUISSE} ; {BERNE} ; {GRENOBLE}},
  booktitle = {},
  journal = {{E}nvironmental {S}cience : {A}tmospheres},
  volume = {3},
  numero = {},
  pages = {942--953},
  year = {2023},
  DOI = {10.1039/d3ea00013c},
  URL = {https://www.documentation.ird.fr/hor/fdi:010087684},
}