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90%
60%
20%
10%
Liquids
Solids
Gases
All of these
True
False
Approximately 90%
Approximately 75%
Approximately 60%
Approximately 45%
1700-1730
1730-1760
1760-1820
1820-1860
True
False
Lung cancer
Heart disease and stroke
Lower respiratory infections
Something else
40%
45%
50%
60%
7
6
5
4
96%
97%
98%
99%
60%
70%
80%
90%
0.8 c
1.0 c
1.1 c
2 c
77%
87%
97%
67%
Oxygen
Methane
Water vapour
Nitrous oxide
10%
20%
40%
50%
50%
80%
25%
60%
8
9
10
11
One third
One half
Two thirds
Three quarters
14%
40%
50%
24%
10%
25%
60%
6%