Singapore and Kuala Lumpur Have the World's Dirtiest Air

Singapore had the world's dirtiest air on October 13, 2026, followed by Kuala Lumpur, according to IQAir. Singapore scored 199 on a scale that measures how clean or dirty air is, Kuala Lumpur 183 — like breathing smoky air that can sting the lungs. IQAir ranked them first and second worldwide.