Nearly every country on Earth has dirtier air than doctors recommend breathing, a report has found. From a report: Only seven countries met the World Health Organization's guidelines for tiny toxic particles known as PM2.5 last year, according to analysis from the Swiss air quality technology company IQAir. Australia, New Zealand and Estonia were among the handful of countries with a yearly average of no more than 5ug of PM2.5 per cubic metre, along with Iceland and some small island states.

The most polluted countries were Chad, Bangladesh, Pakistan, the Democratic Republic of the Congo and India. PM2.5 levels in all five countries were at least 10 times higher than guideline limits in 2024, the report found, stretching as much as 18 times higher than recommended levels in Chad. Doctors say there are no safe levels of PM2.5, which is small enough to slip into the bloodstream and damage organs throughout the body, but have estimated millions of lives could be saved each year by following their guidelines. Dirty air is the second-biggest risk factor for dying after high blood pressure.

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