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Covid 19 quarantine’s effects on air quality in Bogota and twenty cities world wide statistical analysis (january to july 2020)
Análisis estadístico de los efectos de la cuarentena por covid 19 en la calidad del aire de Bogotá y 20 ciudades del mundo (enero a julio de 2020)
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Covid 19 quarantine’s effects on air quality in Bogota and twenty cities world wide statistical analysis (january to july 2020). (2023). Revista EIA, 20(40), 4021 pp. 1-33. https://doi.org/10.24050/reia.v20i40.1701
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Objective: to compare air pollution’s behavior during quarantine in the city of Bogota, in regard to other cities in the world in aspects such as population, area, among others, through a statistical analysis of the concentration data of pollutants PM10, PM2.5 and NO2, for the period from January to July 2020.
Materials and methods: 20 cities were selected according to the matrix for the study. Using the BOOTSTRAPPING technique, a correlation matrix and histograms were made for each of the pollutants per phase. For the application of the PCA, the analysis was carried out using MATLAB software, with respect to the averages per phases and change magnitudes. SPSS software was used to normalize the data for the treatment of the variables of interest. Making use of ARIMA and ETS modeling, the data were analyzed longitudinally, the forecast of concentrations with and without quarantine, including the comparison between cities.
Results: In the reactivation phase, Bogota presented a significant increase in its pollution levels, especially in PM10. In the differences between the phases before and reactivation, Bogota obtained a lower magnitude in the case of PM2.5, while for NO2 it was more remarkable.
Conclusions: In the quarantine, Bogota experienced a significant decrease in the concentration of PM10 and NO2. This was not the case for PM2.5 concentration due to different temporary events (fires and particulate matter transportation).
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