WHO reveals over 90% of world breathing bad air

The data focuses on dangerous particulate matter with a diameter of less than 2.5 micrometres, or PM2.5.

PM2.5 includes toxins like sulfate and black carbon, which can penetrate deep into the lungs or cardiovascular system.

Air with more than 10 microgrammes per cubic metre of PM2.5 on an annual average basis is considered substandard.  

In some regions satellite data has been complemented by ground-level PM2.5 measurements, but in much of the developing world ground readings remain unavailable, forcing the WHO to rely on cruder estimates.

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