China is the country with the worst air pollution in the world. However the average air pollution in China pales into insignificance compared to the air pollution of New Delhi, the city with the worst global air pollution.
You can compare your country and city's air pollution to these two extremes on a new Pollution Map from Yale University. This visualization of the world's air pollution uses data from WHO's Ambient Air Pollution database (city level) and the 2014 Environmental Performance Index (EPI) (country level) to show the air pollution in each country in the world and in a number of the world's largest cities.
If you want to know more about how the map was made you can read a write-up by Pedro Cuhna in this week's CartoDB Map of the Week post.
If you want to view real-time air pollution readings then you should check out these maps:
Worldwide - Real-time Air Quality Index Visual Map
UK - Defra Air Pollution Forecast
Houston - The Houston Clean Air Network
Hong Kong - Hedley Environment Index
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