India, May 9 -- Construction work on the metro expansion corridors connecting Pimpri to Nigdi and Swargate to Katraj has come to a standstill due to disruption in the supply of ready-mix concrete (RMC), Maharashtra Metro Rail Corporation Limited (Maha-Metro) officials said on Friday.

The halt follows recent action by the Pune Municipal Corporation (PMC) and the Maharashtra Pollution Control Board (MPCB) against several RMC plants across Pune and Pimpri-Chinchwad over alleged environmental violations, pollution concerns and illegal operations. The crackdown has severely affected the availability of concrete required for metro construction work.

PMC has taken action against around 30 RMC plants over the past three months, including sealin...