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air quality
This term is primarily used in technical, environmental, and governmental contexts to describe the presence of pollutants in the atmosphere. It carries a clinical or administrative tone, often appearing in reports, legislation, and public health warnings rather than casual conversation.
As a compound noun, it functions as an uncountable mass noun. It describes a state or condition rather than a discrete object, meaning it cannot be pluralized or counted with numbers. One refers to the improvement or degradation of air quality, not "air qualities."