The measurement of the cleanliness and purity of air in a specific area, often assessed for pollutants and other harmful substances.

वायु गुणवत्ता

English Usage: The air quality in the city has improved significantly over the past few years.

Hindi Usage: शहर में वायु गुणवत्ता पिछले कुछ वर्षों में काफी सुधरी है।