Mumbai, Jan. 9 -- The city saw a cooler morning on Thursday, as air quality stayed in the "moderate" range, with regulators stepping up action against construction-linked pollution sources across the Mumbai Metropolitan Region (MMR). According to the India Meteorological Department (IMD), minimum temperatures dipped to 16.9degC on Thursday, after hovering around 19degC on Wednesday. IMD officials said the temperature pattern is likely to remain steady over the next few days. "Minimum temperatures are expected to range between 20degC and 21degC, while maximum temperatures will be around 32degC to 33degC," an IMD official said. Meanwhile, Mumbai's overall air quality index (AQI) stood at 126, according to data from the Central Pollution Control Board (CPCB), keeping the city in the "moderate" category. While the AQI has remained around this range through the week, several pockets recorded higher readings. Byculla emerged as one of the worst-affected areas with AQI at 186, followed by Mindspace-Malad West at 184, Mazgaon at 171, and Chhatrapati Shivaji Maharaj International Airport (T2) at 169. Against this backdrop, the Maharashtra Pollution Control Board (MPCB) said it had intensified enforcement against polluting construction units. In a note issued on Thursday, the board said its flying squads had inspected 44 ready-mix concrete (RMC) plants and ongoing construction projects in MMR over the last two days, following directions of the high court. "Ten RMC plants have been ordered shut for non-compliance with environmental guidelines," the board said, adding that 17 plants were issued proposed directions and four plants were served interim directions. Penalties amounting to Rs.84 lakh were recovered from 17 RMC plants in Kalyan, Navi Mumbai and Raigad. "Strict action is being taken against establishments that do not comply with environmental regulations, and this enforcement drive will continue," said an MPCB official, adding that daily reviews of air pollution control measures are underway....