Navi Mumbai, Jan. 8 -- The Navi Mumbai Municipal Corporation (NMMC) on Wednesday ordered the immediate closure of 19 construction sites and issued notices to 42 others for violating environmental safety norms. The move follows the city's air quality index breaching the 200-mark in several areas recently. The NMMC has issued notices to 10 sites and instruction letters to another 32 for failing to curb dust emissions. P6...