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Importance of reducing pollution, by age
Age (years)	Girls	Boys	All students
	average score on 1,000
8	782	772	776
9	797	779	788
10	787	751	768
11	781	730	755
12	763	708	736
13	739	660	700
14	699	575	641
15	658	553	608
16	622	540	581
17	637	541	591
18	670	541	595
19	641	703	679
Source: Statistics Canada, Census at School, 2008/2009.