Collocations for pollutant - noun

air, atmospheric, environmental, water
biological, chemical, hazardous, organic, toxic
major
common
Both are common pollutants and suspected carcinogens.

industrial
airborne

discharge, emit, release
reduce
a washable filter to reduce air pollutants

remove

pollutant from
pollutants from nearby industries

pollutant in
pollutants in exhaust gases

the emission of pollutants, the release of pollutants