NEW DELHI: Residents in India's northern states woke up to another day of poor air quality on Tuesday (Nov 19), as a layer of dense fog shrouded most of the region, and pollution in the capital Delhi remained severe. India battles air pollution every winter as cold, heavy air traps dust, emissions, and smoke from farm fires started illegally in the adjoining, farming states of Punjab and Haryana. The air quality index (AQI) touched a peak of 491 in Delhi on Monday, forcing the government to