In 2022, the global share of national populations exposed to hazardous concentrations of air pollution varied significantly across countries, with South Asian nations bearing the brunt of this environmental challenge. Bangladesh led the list with 97.9% of its population facing hazardous levels of air pollution. This concerning statistic is largely driven by household emissions from cooking with solid fuels, industrial discharge into major rivers, and unmanaged waste, including plastics and untreated sewage. Following closely behind are Nepal, India, and Pakistan also reported above 90% of their populations being exposed to hazardous air quality due to rapid industrialization. India's average life expectancy is reduced by 5.3 years due to PM2.5 pollution, according to the Air Quality Life Index (AQLI) published by the Energy Policy Institute at the University of Chicago. India and Pakistan have also resorted to cloud seeding to induce artificial rain as a measure to mitigate smog. Singapore, a developed economy, faces high levels of air pollution, primarily stemming from traffic and industrial activities throughout the year, exacerbated by seasonal risks such as haze from forest fires in neighboring island states. Motor vehicles in Singapore significantly contribute to air pollution. To mitigate emissions and protect public health, the NEA (National Environment Agency) establishes air pollution regulations, exhaust emission and fuel quality standards for all vehicles.