AP Environmental Science 9.C: Greenhouse Gases
Practice AP Environmental Science questions on carbon dioxide, methane, water vapor, nitrous oxide, CFCs, and the greenhouse effect.
- Syllabus
- Effective Fall 2025
- Course
- AP Environmental Science
Practice AP Environmental Science questions on carbon dioxide, methane, water vapor, nitrous oxide, CFCs, and the greenhouse effect.
The graph shows measurements of atmospheric levels of carbon dioxide ( CO2 ) at Mauna Loa Observatory, Hawaii, and the measurements of pH levels in the ocean nearby at Station ALOHA. Measurements of pH began in 1992.

ATMOSPHERIC CARBON DIOXIDE AT MAUNA LOA AND OCEANIC pH AT STATION ALOHA, HAWAII
Use the graph above to answer the following questions.
Determine the concentration of CO2 (in ppm) recorded at Mauna Loa in 2005.
(1 point for identifying from the graph the correct value of concentration of CO2 recorded at Mauna Loa in 2005)
380 ppm (+/-5 ppm)