Only seven countries and three territories last year met World Health Organization pollution guidelines for fine particulate matter, the most risky form of pollution to human health.
A report published Tuesday by the Swiss company IQAir looked at fine particular matter pollution (also known as PM 2.5) data collected by more than 30,000 ground-level air quality monitoring stations across 134 countries last year.
Of these countries, seven had annual averages within the WHO’s guidelines of 5 micrograms per cubic meter in 2023: Australia, Estonia, Finland, Grenada, Iceland, Mauritius and New Zealand. French Polynesia, Bermuda and Puerto Rico also met the guidelines.
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