21.As per a recent survey conducted by IQAir, which city was ranked the world’s most polluted capital for the third consecutive year? [A] Beijing [B] New Delhi [C] Moscow [D] Berlin Show Answer
NEW DELHI (Reuters) - New Delhi was the world's most polluted capital for the third straight year in 2020, according to IQAir, a Swiss group that measures air quality levels based on the concentration of lung-damaging airborne particles known as PM2.
