Discussion
An area source emits \( 3.2 \) tonnes of PM10 a year from \( 4.0 \) square kilometres. The emission density is
Answer: A
Correct answer: 0.8 tonnes per km\(^2\) per year
Emission density is the total emission divided by the area:
\[ \frac{3.2\ \mathrm{t/yr}}{4.0\ \mathrm{km^2}} = 0.8\ \mathrm{t\ per\ km^2\ per\ year} \]
The distractor \( 12.8 \) multiplies instead of dividing. Expressing an area source this way is what allows it to be entered into a dispersion model, which distributes the emission over the grid cells the source covers rather than treating it as a plume from a single point.
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