The Central Pollution Control Board will deploy 50 teams for extensive field visits from October 15 to ensure strict vigilance as pollution levels rise in Delhi and adjoining areas. The teams will monitor sources of pollution at ground level and polluting activities for immediate action. The teams will focus on hotspot areas where the problem gets aggravated. An Environment Ministry spokesperson said that they will be using app for regular updates on air quality. The teams will visit Delhi hotspots and adjoining cities such as Noida, Ghaziabad, Meerut, Gurugram, Faridabad.