Delhi and Lahore have been named the most polluted cities in the world. Pakistani Lahore was once called the “city of gardens,” but now most of the trees in this city have been cut down, and in recent decades alone it has lost about 75% of its green spaces. Today, the population of Lahore is more than 13 million people, and the city itself has become one of the most polluted in the world. Scientists note that it will soon become unsuitable for life.