Mumbai, Dec. 29 -- With haze lingering over parts of Mumbai, the Maharashtra Pollution Control Board on Sunday said it has shut four ready mix concrete plants and collected Rs.1.87 crore in fines from 37 others. The BMC inspected major construction sites to check dust-control measures. Though the city's overall AQI was moderate at 132, several areas recorded poor air quality, prompting authorities to warn of strict action against violators. P3...