Analyzing the Interplay of Air Pollution and COVID-19: A Review on Health Implications.

The COVID-19 pandemic has had a profound impact on global public health, highlighting the complex relationship between air pollution and disease transmission. Approximately 2.3 billion people live in regions with high levels of air pollution, particularly in the Asia-Pacific region, with countries like India facing severe challenges. This review examines the association between various pollutants, including PM_2.5, PM₁₀, NO₂, SO₂, and CO, and the spread, severity, and mortality of COVID-19. Particulate matter, particularly fine particles, serves as a carrier for viral particles, facilitating faster transmission and increasing respiratory vulnerability. Studies have shown that long-term exposure to air pollutants exacerbates the severity of COVID-19 symptoms, especially in densely populated urban areas. During the lockdown phases, significant reductions in air pollution were observed, including decreases in PM_2.5 by up to 93%, PM10 by 83%, and NO₂ levels, which contributed to improved air quality and potentially mitigated COVID-19 mortality rates. The review also underscores regional disparities, with marginalized populations bearing a disproportionate burden of pollution exposure and health impacts. Gaseous pollutants such as NO₂ were found to contribute to respiratory inflammation, increasing the susceptibility to severe COVID-19 outcomes. Additionally, the review explores the influence of meteorological and climatic factors on COVID-19 outcomes, noting the varying impact of temperature, humidity, and other factors depending on the season, geographical location, and latitude. These findings offer critical insights for policymakers and public health authorities in developing strategies for mitigating both air pollution and COVID-19 transmission.