The Brihanmumbai Municipal Corporation (BMC) has shut down 78 construction sites in Borivli East and Byculla due to rising dust pollution. Construction will only resume after all sites implement BMC’s 28-point Dust Mitigation Guidelines, introduced last year.  The decision follows the implementation of the Graded Response Action Plan (GRAP-4) as air quality in these areas dipped to an Air Quality Index (AQI) of 200 over the past few days.