Mad rush for oxygen tanks, air purifiers in haze-choked Southeast Asia. Toxic haze from wildfires burning in Indonesia has spiked a demand for oxygen tanks and air purifiers across the region, manufacturers say, as they work the clock on equipment providing life-saving clean air. The months-long haze has blanketed parts of Southeast Asia, forcing school closures and fuelling a rise in respiratory complaints. Families are now rushing to buy devices to keep indoor air clean.