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Levels > 50g/m 3 in 78% of classrooms<br />
300<br />
250<br />
200<br />
150<br />
100<br />
50<br />
0<br />
PM 10 mean concentration (g/m 3 )<br />
Standard by US-EPA US EPA<br />
(24 24hr) hr)<br />
Standard by US-EPA US EPA<br />
(annual)<br />
Siena Udine Oslo Uppsala Aarhus Reims<br />
Sigsgaard<br />
Sept 2012<br />
Sigsgaard<br />
Sept 2012<br />
12
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