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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

abstraction, abstract entity go
a general concept formed by extracting common features from specific examples

attribute go
an abstraction belonging to or characteristic of an entity

state go
the way something is with respect to its main attributes

condition, status go
a state at a particular time

impurity, impureness go
the condition of being impure

pollution go
undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities

air pollution
pollution of the atmosphere

noun.state

5 Subcategories

acid rain, acid precipitation go
rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water
industrial air pollution go
pollution resulting from an industrial plant discharging pollutants into the atmosphere
miasma, miasm go
unhealthy vapors rising from the ground or other sources
small-particle pollution go
air pollution caused by fine particles of soot (as from power plants or diesel engines)
smog, smogginess go
air pollution by a mixture of smoke and fog