Cities with historically high particulate matter (PM2.5) concentration levels also experienced a substantial reduction in pollution—although further analysis is needed to determine whether natural sources or human activities explain this decrease.
South Asian cities are known hotspots for air pollution. But in the last few months, many have enjoyed unusually clear skies and fresh air.
blogs.worldbank.org
South Asia is also among the world’s regions most exposed to household air pollution. About 79 percent of the population in Bangladesh, 60 percent in India, and 52 percent in Pakistan are exposed to pollution from burning of solid fuels, which contribute significantly to poor health in the region.
While lockdowns have provided the temporary side benefit of cleaner air and bluer skies, previous exposure to pollution has likely made more South Asians vulnerable to contracting severe respiratory diseases, including complications from COVID-19. As of June 22, COVID-19 cases in South Asia have been rising exponentially, with more than 735,000 confirmed so far, mostly in India, Pakistan, and Bangladesh.
Medical experts place vulnerabilities related to respiratory ailments such as asthma and chronic lung disease high on the list of preexisting conditions that can make people more susceptible to COVID-19. Among the first hospitalized patients, pneumonia, sepsis, respiratory failure, and acute respiratory distress syndrome were reported as the most frequent complications.