Kolkata's Air Quality Worsens; Falls Under 'Poor' & 'Very Poor' Categories

The air quality of Kolkata has worsened to the "poor" category in environmental terms, on December 15. In some areas of the northern Kolkata, the air quality has worsened to the "very poor" category. On the contrary, Kolkata's air quality remained in the "good" and "satisfactory" categories until last week. Following are the categories of air quality: good (0-50), satisfactory (51-100), moderate (101-200), poor (201-300), very poor (301-400), severe (401-500).