by Catherine LAI HONG KONG, China (AFP) — As millions of people in Asia choke under polluted skies, authorities have turned to water-dispersing drones and outdoor air purifiers to improve air quality, while companies have tried to cash in by selling everything from canned air to lung-purifying teas. According to the World Health Organisation, 92 percent of the population in the Asia Pacific region are exposed to levels of air pollution that pose a significant […]