Every winter, as Delhi's pollution levels peak, the conversation tends to focus on the same culprits: vehicles, construction, and garbage burning. But one of the biggest contributors to the city's pollution crisis—one that remains with us throughout the year—barely gets discussed: dust.

A year-long Indian Express investigation examined road dust in Delhi and tracked the movement of the city's Mechanical Road Sweeping Machines (MRSMs), its primary defence against dust pollution. The findings reveal serious gaps in coverage and a fleet far smaller than what experts recommend. In this episode, we speak to The Indian Express' Sophiya Mathew and Drishti Jain, who led this investigation for the paper.

To find out whether your zone has been cleaned by MCD's sweeping machines, click here.

Hosted and produced by Shashank Bhargava
Edited and mixed by Suresh Pawar