The Maharashtra Pollution Control Board (MPCB) has issued compliance notices to four ready mix concrete (RMC) plants in Mumbai for violating pollution norms. The notices were issued for not adhering to guidelines such as tyre washing of transporting vehicles, installing dust collectors, and running the plants only during daytime. The MPCB has also started a survey of RMC plants in the city to address air pollution concerns. Additionally, the MPCB has issued notices to other companies, including Aegis Logistics and Sea Lord Containers, for creating dust pollution.