Delhi Environment Minister Gopal Rai on Friday said an additional 106 cluster buses would ply in the city while metro trains would make 60 extra trips in view of GRAP-3 measures imposed due to worsening air quality. The Commission for Air Quality Management (CAQM) has imposed GRAP 3 measures as the national capital recorded the worst pollution levels in the country, with the air quality remaining in the "severe" category for two consecutive days. On Friday the city's air quality was in the severe category with an AQI of 411 at 9 am. Delhi Environment Minister, addressing a press conference said that the Air Quality Index (AQI), which has consistently crossed hazardous levels, led to the enforcement of GRAP-3. "We are working to make GRAP-3 more effective in Delhi," the minister said, adding that a meeting was held with officials from MCD, PWD, transport, DTC, metro, and education departments to review and implement urgent measures. As part of the action plan, the Delhi government