The seven countries worldwide with the cleanest air – and those with the dirtiest

New Zealand was one of only seven countries that meets the - (Getty)

Most of the world has dirty air, with just seven countries globally meeting air pollution guidelines, a report has found.

Australia, New Zealand, Iceland and Estonia alongside the island states of the Bahamas, Barbados and Grenada met the WHO annual average for tiny toxic particles known as PM2.5 last year, according to Swiss-based air quality monitoring database, IQAir.