Barbados, Grenada, and the Bahamas, met the WHO’s annual PM2.5 guideline of 5 µg/m³. This underscores the pervasive nature of air pollution worldwide, with over 90% of monitored countries ...

had the most pollution of any city, the report said. Australia, the Bahamas, Barbados, Estonia, Grenada, Iceland and New Zealand met the WHO guideline for air quality. The cleanest metropolitan ...

A study by UC San Diego researchers reveals that pollutants found in the sewage-laden Tijuana River are ending up in the air ...