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Counting down the world's most polluted cities
Public interest13 of the 15 most polluted cities are in India or Pakistan.
Source: IQAir 2025 World Air Quality Report, PM2.5
NumberReels — Short, sourced data visualizations — one number, one chart, one takeaway. A new reel every day.
Guess of the dayPublic interest
an unknown number
Guess the number: micrograms of PM2.5 per m³ in the worst city
From “Counting down the world's most polluted cities”. Commit to a number, then watch the clip find out.
Source: IQAir 2025 World Air Quality Report, PM2.5
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NumberReels turns a single statistic into a short animated chart you can watch in under a minute. Every clip is built from a named dataset, states the period it covers, and ends with the takeaway rather than opening with it.
Each video has its own page with the narration transcript and the underlying numbers as a table you can copy — so you can check the claim rather than take it on trust. More about how these are made.
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Sourced data
A named dataset and the period it covers — on screen and on the page.
- 02
Animated chart
One of 31 chart formats, chosen for the comparison that matters.
- 03
One takeaway
The number lands on the beat, and the clip ends on what it means.