What are non-viable pariculates ? How are they classified ? Explain .

Explanation

Non-viable particulates `:` The non-viable particulates are small solid particles and liquid droplets suspended in air. They help in the transportation of viable particles. There are four types of non-viable particulates in the atmosphere. They are classificed according to their nature and size as follows .
(i) Smoke `:` Smoke particulate consists of solid particles ( or ) mixtre of solid and liquid particles formed by combustion of organic matter.
Example `:` cigarette smoke, oil smoke ,smokes from burning of fossil fuel, garbage and dry leaves.
(ii) Dust `:` Dust composed of fine solid particles produced during crushing and grinding of solid materials.
Example `:` sand from sand blasting , saw dust from wood works, cement dust from cement factories and fly ash from power genrating units.
(iii) Mists `:` They are formed by particles of spray liquids and condensation of vapours in air.
Example `:` sulphuric acid mist, herbicides and insecticides sprays can form mists.
(iv) Fumes `:` Fumes are obtained by condensation of vapours released during sublimation, distillation, boiling and calcination and by several other chemical reactions.
Example `:` organic solvents , metals and metallic oxides form fumes particles.