Smog covers buildings in the Indian capital, Delhi. According to an air quality index the concentration of airborne particles known as PM2.5, which are considered the most harmful, was more than 10 times the upper limit recommended by the WHO.
Smog covers buildings in the Indian capital, Delhi. According to an air quality index the concentration of airborne particles known as PM2.5, which are considered the most harmful, was more than 10 times the upper limit recommended by the WHO.