
In India’s capital, New Delhi, thick smog envelops the city’s skyline. Hidden in the smog are tiny, harmful particles of air pollution, known as PM2.5, which are linked to one in six deaths around the world.

In India’s capital, New Delhi, thick smog envelops the city’s skyline. Hidden in the smog are tiny, harmful particles of air pollution, known as PM2.5, which are linked to one in six deaths around the world.