Yale Environment 360: Billowing smoke from illegal fires on the Indonesian island of Sumatra has engulfed Singapore this week, pushing air pollution to record levelsfor three consecutive days. The smoke, which is captured in a new NASA satellite image, has created an acrid blanket of smog across the region and historic levels of air pollution. According to government officials, Singapore's air pollution index reached 401 on Friday, a level considered hazardous for breathing. Before this week, the previous high was 226....