Question

Explain the differences between pure air and polluted air. [3 MARKS]

Answer 1

Each point: 1 Mark

$\begin{array}{cc}\text{Pure Air}& \text{Polluted Air}\\ \text{Pure air contains around 78\%}& \text{Polluted air includes gases}\\ \text{nitrogen,21\% oxygen, and 0.03\% carbon}& \text{like sulphur dioxide, nitrogen}\\ \text{dioxide and also small amounts of}& \text{dioxide, carbon dioxide, etc.}\\ \text{argon, methane, ozone, and water vapours}.& \text{and other particulate matter.}\\ \text{Smog is not present.}& \text{Smog can be present.}\\ \text{Not harmful for human beings}& \text{Harmful for human beings as it}\\ & \text{causes diseases like asthma}\end{array}$