Sri Lanka, Dec. 15 -- Construction work was halted and emergency pollution curbs reimposed across India's capital on Monday after the air quality deteriorated sharply to some of the worst levels seen this winter, exposing millions to hazardous smog and disrupting flights.
The air quality index was 493 at 7am on Monday, according to the Central Pollution Control Board, placing Delhi firmly in the "severe" category.
Several parts of the city recorded readings close to the maximum of the scale, with Rohini hitting 500, Ashok Vihar 499, Anand Vihar 493, and RK Puram 477 under a scale used by the pollution board. Swiss air quality monitor IQAir showed readings of 800 and above in many areas, however.
India's air quality monitoring system clas...