The pollution crisis: How our cities struggle to breathe
Delhi is the worst case. But clean air is rare in other cities too. The data reported in this story reveal stark seasonal and regional differences across six Indian metros.

Dipu Rai is an investigative and data journalist based in New Delhi focusing on data-driven stories on finance, health, politics and environment. He is also actively involved in analyses and visualisations of data at India Today's Data Intelligence Unit (DIU).
Dipu is well-versed in SQL, Python, R, Tableau and produces prototype visualisations quickly as per requirement. He is specialised in dealing with a variety of datasets with parsing, scraping and cleaning. Doing Spatial analysis is his hobby, and he frequently uses location intelligence platforms like Carto and QGIS.
After completing the master in economics, Dipu has started his career as a business journalist. He has more than ten years of experience in broadcast, print and digital platforms.
Dipu's work has sparked several financial investigations and won some of journalism's highest honours. He was awarded the Redink Award, in 2015 for financial crime reporting. He has translated Raymond Williams's book 'Television' in Hindi. His hobbies include reading codes, learning new visualisation techniques. In his spare time he likes to read books, listen to music and watch films.
Delhi is the worst case. But clean air is rare in other cities too. The data reported in this story reveal stark seasonal and regional differences across six Indian metros.
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