According to the results of Study 2, as distance from the power plant decreases:
F. Sulfur levels decrease.
G. Sulfur and NO₂ levels increase.
H. NO₂ and O₂ levels decrease.
J. CO₂ and O₂ levels increase.

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