Common examples of SPM are dust, soot, __________and fly ash.
Which of the following will be reduced in air in a city forest when a lot of dust and fly ash is emitted by a coal-based factory in the vicinity?
(a) nitrogen
(b) carbon dioxide
(c) oxygen
(d) water vapour
Which of the following is usually not a water pollutant?
(a) sewage
(b) fertiliser
(c) fly ash
(d) pesticide