Importance of reducing pollution, by age

Age (years)	Girls	Boys	All students

	average score on 1,000
8	797	799	798
9	801	780	790
10	801	778	789
11	778	747	763
12	764	712	738
13	737	689	714
14	732	662	698
15	681	619	653
16	656	556	606
17	638	558	599
18	660	555	605
19	655	579	611
Source: Statistics Canada, Census at School, 2007/2008.