Air pollution is a global challenge, often faced most acutely in Asia. The World Health Organization has estimated that 92% of the Asia Pacific population — about 4 billion people — are exposed to levels of air pollution that pose a significant risk to health. India and China are home to some of the world’s most polluted cities where the concentration of particulate matter often reaches hazardous levels; while Thailand recently became the focus of international attention as schools shut down in Bangkok due to toxic air.
