See the air your city is breathing
Polly fetches live air-quality readings for your location and turns each pollutant into a drift of coloured balls. Every reading is measured against the World Health Organization's safe limits, so the verdict is plain: a value of 2× means twice the level the WHO considers safe — and twice the balls. Fine particles (PM2.5), coarse particles (PM10), nitrogen dioxide, ozone, sulphur dioxide and carbon monoxide each get their own hue.
Allow location access to see your own area, search for any city in the world, or switch to Compare to set two cities side-by-side and see the difference at a glance. Hay-fever sufferer? In Europe you can flip the toggle from air quality to live pollen levels — grass, birch, ragweed and more. Curious where the numbers come from? Read how Polly works and where the data comes from.