Carbon monoxide is another gaseous byproduct associated with coal-burning power plants. If carbon monoxide levels behave like the sulfur gas levels in Study 2, one would expect that carbon monoxide levels:
F. Would increase as distance from power plant increases.
G. Would be higher when O₂ levels are higher.
H. Would decrease as distance from power plant increases.
J. Would be lower when NO₂ levels are higher.

Study 2
The researchers believe that the emissions from the nearby power plant are somehow affecting the decay of the limestone. Levels of common gases – carbon dioxide (CO₂), oxygen (O₂), nitrogen dioxide (NO₂), and sulfur (S) – in the atmosphere were tested at the cemetery and other locations at specific distances from both the cemetery and the power plant. Measurements in parts per million (ppm) were recorded in Table 2.

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Distance from power plant (m) 0 100 200 300 400 Distance from cemetery (m) 125 225 325 425 525 Table 2 CO₂ levels (ppm) 7 8 10 11 13 0₂ levels (ppm) 3 5 12 14 17 NO₂ levels (ppm) 13 10 9 5 3 S levels (ppm) 26 22 17 10 5