The Canadian wildfires have affected cities in the United States of America with a considerable rise in pollution levels, making New York as world's most polluted city on Tuesday.
Among the most polluted cities with respect to PM2.5 levels, Delhi (99.71 micrograms per cubic metre) ranked first, Haryana's Faridabad (95.64 micrograms per cubic metre) ranked second and Uttar Pradesh's Ghaziabad (91.25...
