Author:
Hernández-Paniagua Iván Y.,Valdez S. Ivvan,Almanza Victor,Rivera-Cárdenas Claudia,Grutter Michel,Stremme Wolfgang,García-Reynoso Agustín,Ruiz-Suárez Luis Gerardo
Abstract
Meteorology and long-term trends in air pollutant concentrations may obscure the results from short-term policies implemented to improve air quality. This study presents changes in CO, NO2, O3, SO2, PM10, and PM2.5 based on their anomalies during the COVID-19 partial (Phase 2) and total (Phase 3) lockdowns in Mexico City (MCMA). To minimise the impact of the air pollutant long-term trends, pollutant anomalies were calculated using as baseline truncated Fourier series, fitted with data from 2016 to 2019, and then compared with those from the lockdown. Additionally, days with stagnant conditions and heavy rain were excluded to reduce the impact of extreme weather changes. Satellite observations for NO2 and CO were used to contrast the ground-based derived results. During the lockdown Phase 2, only NO2 exhibited significant decreases (p < 0.05) of between 10 and 23% due to reductions in motor vehicle emissions. By contrast, O3 increased (p < 0.05) between 16 and 40% at the same sites where NO2 decreased. During Phase 3, significant decreases (p < 0.05) were observed for NO2 (43%), PM10 (20%), and PM2.5 (32%) in response to the total lockdown. Although O3 concentrations were lower in Phase 3 than during Phase 2, those did not decrease (p < 0.05) from the baseline at any site despite the total lockdown. SO2 decreased only during Phase 3 in a near-road environment. Satellite observations confirmed that NO2 decreased and CO stabilised during the total lockdown. Air pollutant changes during the lockdown could be overestimated between 2 and 10-fold without accounting for the influences of meteorology and long-term trends in pollutant concentrations. Air quality improved significantly during the lockdown driven by reduced NO2 and PM2.5 emissions despite increases in O3, resulting in health benefits for the MCMA population. A health assessment conducted suggested that around 588 deaths related to air pollution exposure were averted during the lockdown. Our results show that to reduce O3 within the MCMA, policies must focus on reducing VOCs emissions from non-mobile sources. The measures implemented during the COVID-19 lockdowns provide valuable information to reduce air pollution through a range of abatement strategies for emissions other than from motor vehicles.
Funder
Universidad Nacional Autónoma de México
Subject
Public Health, Environmental and Occupational Health
Reference65 articles.
1. Are lockdown measures effective against COVID-19?;Kharroubi;Front Public Health,2020
2. MxGob (Mexican Government) 2020 Covid-19 México Casos diarios por Estado + Nacional
3. 2020 ACUERDO Número 02/03/20 por el que se Suspenden las Clases en las Escuelas de Educación Preescolar Primaria Secundaria Normal y Demás Para la Formación de Maestros de Educación Básica del Sistema Educativo Nacional así Como Aquellas de los Tipos Medio Superior y Superior Dependientes de la Secretaría de Educación Pública.
4. CSG(CONSEJO DE SALUBRIDAD GENERAL)
ACUERDO por el que se Declara Como Emergencia Sanitaria por Causa de Fuerza Mayor a la Epidemia de Enfermedad Generada por el Virus SARS-CoV2 (COVID-19). Diario Oficial de la Federación Lunes 30 de Marzo de 20202020
5. MxGob (Mexican Government) 2020 Comunicado Salud Inicia la fase 3 por COVID-19
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