4.13—Pollutants

Know that pollutants, including carbon monoxide, oxides of nitrogen and sulfur, carbon particulates and unburned hydrocarbons, are emitted during the combustion of alkane fuels.

Use —pollutants to connect the rule to the data and decision in the question.

This matters because —pollutants determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —pollutants to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —Pollutants is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.