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Influence of biomass burning on ozone levels in the Megalopolis of Central Mexico during the COVID-19 lockdown.
Almanza, Victor; Ruiz-Suárez, Luis Gerardo; Torres-Jardón, Ricardo; García-Reynoso, Agustín; Hernández-Paniagua, Iván Y.
Afiliación
  • Almanza V; Institute for Atmospheric Sciences and Climate Change, National Autonomous University of Mexico, Coyoacan 04510, Mexico City, Mexico.
  • Ruiz-Suárez LG; Institute for Atmospheric Sciences and Climate Change, National Autonomous University of Mexico, Coyoacan 04510, Mexico City, Mexico.
  • Torres-Jardón R; Institute for Atmospheric Sciences and Climate Change, National Autonomous University of Mexico, Coyoacan 04510, Mexico City, Mexico.
  • García-Reynoso A; Institute for Atmospheric Sciences and Climate Change, National Autonomous University of Mexico, Coyoacan 04510, Mexico City, Mexico.
  • Hernández-Paniagua IY; Institute for Atmospheric Sciences and Climate Change, National Autonomous University of Mexico, Coyoacan 04510, Mexico City, Mexico. Electronic address: ivan.hernandez@atmosfera.unam.mx.
J Environ Sci (China) ; 143: 99-115, 2024 Sep.
Article en En | MEDLINE | ID: mdl-38644027
ABSTRACT
The massive reductions in anthropogenic emissions resulting from the COVID-19 lockdown provided a unique opportunity to evaluate the effect of mitigation measures aiming to abate air pollution. In Mexico, the total lockdown period took place during the dry-hot season when biomass burning activity is enhanced. Here, we investigate the role of biomass burning emissions on regional ozone levels in the Megalopolis of Central Mexico. The studied period covers the lockdown phases 2 and 3, and the first month of the New Normal. We applied a factor separation technique and process analysis to estimate the pure and synergistic contributions of emission reductions under lockdown and that from biomass burning to daily ozone maximum concentrations in 7 metropolitan areas of different states in the Megalopolis. The results revealed that biomass burning plumes likely masked the effect of massive reductions from mobile emissions, impacted the PBL development during phase 3 and favored transition and mixed NOx-limited and VOC-limited regional regimes. This contributed to increased ozone production in the middle to lower PBL by changing the regional background levels which potentially could bias high ozone production efficiency estimations. Given the Megalopolis contribution to economic and societal development at national scale, our study suggests that ozone mitigation measures during the dry-hot season targeting mainly mobile emissions will likely be offset by biomass burning plumes. A regional and synergic policy aiming to control biomass burning would help to reduce the occurrence of high ozone levels in Central Mexico with the co-benefit of tackling short-lived climate pollutants.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Ozono / Biomasa / Contaminantes Atmosféricos / Contaminación del Aire / COVID-19 País/Región como asunto: Mexico Idioma: En Revista: J Environ Sci (China) Asunto de la revista: SAUDE AMBIENTAL Año: 2024 Tipo del documento: Article País de afiliación: México Pais de publicación: Países Bajos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Ozono / Biomasa / Contaminantes Atmosféricos / Contaminación del Aire / COVID-19 País/Región como asunto: Mexico Idioma: En Revista: J Environ Sci (China) Asunto de la revista: SAUDE AMBIENTAL Año: 2024 Tipo del documento: Article País de afiliación: México Pais de publicación: Países Bajos