BMC has approved 15 low-cost air quality sensors, costing between ₹1-2 lakh each, for construction sites, complying with Bombay High Court directives. Readings will be displayed on-site and online to alert authorities and residents about air quality breaches. Keval Valambhia, COO of CREDAI-MCHI, a body of real-estate developers, said that mandating air quality sensors is a good step.