Continuous ambient air quality monitoring systems are to be installed at two locations in the city in the first week of next month. Officials of the Tamil Nadu Pollution Control Board (TNPCB) said the equipment, each costing around Rs.70 lakh, would be installed at IIT-Madras, near the Velachery gate of the campus, and Metropolitan Transport Corporation depot in Alandur. The systems would be installed by the Central Pollution Control Board.