Hanoi and Ho Chi Minh City rank among the world’s most polluted cities. The millions of petrol motorbikes are huge ...

Many cities worldwide struggle with air pollution, caused by everything from endless cars to power-guzzling factories. And sadly, in many urban hubs across the globe, air pollution is on the rise – in ...

It’s easy to tell when it’s smog season in New Delhi; the air gets darker, heavier and starts scratching the throats and testing the lungs of the city’s 34 million residents. Pollution been an issue ...