MCD to extend road-sweeper shifts from Nov 1, run 66 machines at night, add 2,000 workers and 70 new sweepers to curb Delhi pollution. Delhi road sweepers will work longer night shifts as MCD adds 70 machines and 2,000 workers to improve cleaning and pollution control. While roadside dust continues to be one of the biggest contributors to Delhi’s air pollution, the city’s mechanical road sweeping (MRS) operations have largely remained confined.