MUMBAI, Dec. 2 -- As the BMC's flying squads inspected construction sites to check their adherence to air quality norms, they found rules being flouted at the bullet train construction site at the Bandra-Kurla Complex. Under GRAP 4, which was enforced in the city till December 1, the construction sites were required to follow 28 guidelines, which included installing water sprinklers and water-misting machines to suppress dust. Other guidelines mandated builders to develop an Environmental Management Plan, cover buildings with a green cloth/jute sheet/metal cover of at least 25 feet around construction projects and install radar and sensor-monitoring systems. "On Friday, the squad inspected the bullet train site and found irregularities such as the absence of misting machines," said an official. "We have sent them a show-case notice which they are expected to reply to within seven days and rectify the situation at the earliest." An National High-Speed Rail Corporation Ltd official told HT that all the guidelines issued by local authorities were being complied with. "We will make sure that all dust-mitigation measures like mist guns are used at the bullet train station at BKC," he said. "Over 85% of the excavation work has been completed, and currently only the base slab casting work is in progress. We will comply with the local authorities' instructions and make sure the bullet train construction activities don't cause any air pollution."shreya jachak...