Pakistan
Karachi tops the list of world’s 10 most polluted cities
Karachi has been ranked the most polluted among the top ten major cities, according to the US Air Quality Index. The index released by the Switzerland-based IQAir company says PM2.5 is the main pollutant responsible for the worsening environment situation. “PM2.5 concentration in Karachi is currently 7.6 times the World Health Organization’s annual air quality…
