NEW DELHI: Hundreds of Delhi residents staged a rally on Tuesday, demanding immediate government action to address the worsening air quality in the Indian capital region, where pollution levels have reached extreme and hazardous levels. Pollution in Delhi and the surrounding metropolitan area — home to about 30 million people — has been in the “very poor” category for weeks, with some areas reaching the “severe” category on Tuesday with an Air Quality Index score of at least 402, according to data from the Central Pollution Control Board.

India's air quality framework hasn't been comprehensively revised since 2009 and needs an update, say experts.

Delhi's air quality remains 'very poor' with an AQI of 385, as 18 stations report 'severe' conditions.