Farm Fires Make Pollution Worse in Delhi and Lahore
Why does the air quality in New Delhi and Lahore ranks among the world's worst at this time of the year? The answer to this oft-repeated question can be found in the satellite maps constantly updated by the US National Aeronautics and Space Administration (NASA). Indian government recently estimated that 36% of pollution was contributed by farm fires. Here's how NASA Earth Observatory explains it: "The haze visible in this image likely results from a combination of agricultural fires, urban and industrial pollution, and a regional temperature inversion. Most of the time, air higher in the atmosphere is cooler than air near the planet’s surface, and this configuration allows warm air to rise from the ground and disperse pollutants. In the wintertime, however, cold air frequently settles over northern India, trapping warmer air underneath. The temperature inversion traps pollutants along with warm air at the surface, contributing to the buildup of haze." Farm Fires Se...