ARIMA Analysis of PM Concentrations during the COVID-19 Isolation in a High-Altitude Latin American Megacity

Atmosphere, Journal Year: 2024, Volume and Issue: 15(6), P. 683 - 683

Published: June 2, 2024

The COVID-19 pandemic precipitated a unique period of social isolation, presenting an unprecedented opportunity to scrutinize the influence human activities on urban air quality. This study employs ARIMA models explore impact isolation measures PM10 and PM2.5 concentrations in high-altitude Latin American megacity (Bogota, Colombia). Three scenarios were examined: strict (5 months), sectorized (1 flexible (2 months). Our findings indicate that exert more pronounced effect short-term simulated (PM10: −47.3%; PM2.5: −54%) compared long-term effects −29.4%; −28.3%). suggest tend diminish persistence over time, both short long term. In term, appear augment variation concentrations, with substantial increase observed for PM2.5. Conversely, these seem reduce variations PM indicating stable behavior is less susceptible abrupt peaks. differences reduction between 23.8% 12.8%, respectively. research provides valuable insights into potential strategic improve quality environments.

Language: Английский

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A New Method Proposed for the Estimation of Exposure to Atmospheric Pollution through the Analysis of Black Pigments on the Lung Surface

Atmosphere, Journal Year: 2024, Volume and Issue: 15(9), P. 1126 - 1126

Published: Sept. 17, 2024

Megacities can be considered excellent laboratories for studying the effects of urban environment on human health. Typically, exposure to pollution is estimated according daily or annual averages pollutant concentrations, collected at monitoring stations, using satellite data remote sensing levels, considering proximity major roads, through personal with portable sensors. However, these approaches fall short in identifying individual values over a lifetime. It well established that individuals living large areas inhale atmospheric particles containing carbonaceous components, resulting deposition black pigments lung tissue, known as carbon anthracosis. This study aims detail procedures assessing such pigments, which serve an estimate individual’s particles. Data collection involves administering detailed questionnaires and capturing images autopsy room. The analysis based macroscopic quantification supplemented by evaluation habits clinical histories individuals. method estimating lifetime inhaled provides valuable tool understanding correlation between its potential health effects.

Language: Английский

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Assessment of Indoor PM<sub>2.5 </sub>Concentration and Its Metal Compounds in Select Residential Dwellings in Antananarivo and Mahajanga Cities, Madagascar

American Journal of Applied Chemistry, Journal Year: 2024, Volume and Issue: 12(6), P. 173 - 183

Published: Dec. 30, 2024

Indoor air quality (IAQ) is crucial for human health, especially in urban areas where people spend most of their time indoors. In cities like Antananarivo and Mahajanga, Madagascar, various factors contribute to poor IAQ, posing significant health risks. A total 26 samples were collected, comprising 16 from 10 Mahajanga. The concentrations PM<sub>2.5</sub> metallic trace elements (Aluminum (Al), Titanium (Ti), Chromium (Cr), Manganese (Mn), Iron (Fe), Nickel (Ni), Copper (Cu), Zinc (Zn), Lead (Pb)) analyzed using descriptive statistics. Statistical methods, including the Shapiro-Wilk test normality, independent t-tests comparing means between cities, one-way ANOVA analyzing site-to-site variation within applied assess data. analysis revealed a PM<sub>2.5 </sub>concentration ranging 4.80 µg/m³ 58.45 µg/m³, with mean 24.39 across all sampling sites, 68.75% 50.00% Mahajanga exceeding World Health Organization (WHO) guideline 15 µg/m³. average aluminium, titanium, chromium, manganese, iron, nickel, copper, zinc lead 0.6797 0.0382 0.0015 0.0176 0.4045 0.0001 0.0021 0.0076 0.0023 respectively. showed no statistically difference </sub>concentrations two cities. However, indicated variability </sub>levels among different sites each city, highlighting spatial heterogeneity indoor pollutant concentrations. This study emphasizes need targeted, localized interventions address disparities mitigate risks associated elevated environment. findings suggest that further research policy efforts should focus on developing strategies improve IAQ Madagascar's safeguard public health.

Language: Английский

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