A) 200 ppm to 300 ppm
B) 120 ppm to 280 ppm
C) 280 ppm to 370 ppm
D) 350 ppm to 450 ppm
Correct Answer: C
Solution :
In 2010, the average monthly concentration for atmospheric \[C{{O}_{2}}\] is about 389 parts per million (ppm). In 2009, it was 387.35 ppm. Since, the (1978) start of precision \[C{{O}_{2}}\]measurements in the atmosphere, the annual mean concentration of \[C{{O}_{2}}\] has only increased from one year to next. There have been no decreases in annual \[C{{O}_{2}}\] levels since, direct instrument measurements began. The \[C{{O}_{2}}\] data below provides a simple overview of the annual trend.| Year | \[C{{O}_{2}}\](open) |
| 2010 | \[\sim \]389 |
| 2009 | 387.35 |
| 2008 | 385.57 |
| 2007 | 383.71 |
| 2006 | 381.85 |
| 1997 | 363.47 |
| 1992 | 356.27 |
| 1987 | 348.98 |
| 1959 | 1315.98 |
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