The study, which examined the effects of pollution on cities around the world, took into account such factors as air quality, waste treatment, safety, housing, education, transportation, and public services.
Penelitian itu, yang mengkaji dampak polusi di kota - kota seluruh dunia, memperhitungkan faktor - faktor seperti kualitas udara, pengelolaan limbah, keselamatan, perumahan, pendidikan, transportasi, dan pelayanan umum.