During the 11 years, the concentration of CO 2 increased obviously, while the concentration of CO showed a trend of first rising and then decreasing.
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Analysis of Atmospheric CO<sub>2</sub> and CO at Akedala Atmospheric Background Observation Station, a Regional Station in Northwestern China.
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The sentences
The results show that the annual average CO 2 concentration showed an increasing trend (growth rate: 1.90 ppm year −1 ), ranging from 389.80 to 410.43 ppm, and the annual average CO concentration also showed an increasing trend (growth rate: 1.78 ppb year −1 ), ranging from 136.30 to 189.82 ppb.