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.
Saastatuse mõju uuriti kogu maailma linnades ning arvesse võeti selliseid tegureid nagu õhukvaliteet, jäätmekäitlus, ohutus, elamistingimused, haridus, transport ja kommunaalteenused.