Delhi's air quality dips into 'severe' category
The air quality index from 0 to 100 is considered 'good', 100 to 200 'moderate', 200 to 300 'poor', 300 to 400 'very poor' and from 400 to 500 or above 'severe'.
Grap-3 has been lifted in the national capital but the government is trying to ensure that Grap-1 and 2 are strictly implemented. Image: ANI