Temporal characteristics of carbon dioxide and ozone over a rural-cropland area in the Yangtze River Delta of eastern China.

In this study, rural atmospheric carbon dioxide (CO) and ozone (O) were measured from January 2015 to December 2018 to investigate characteristics of greenhouse gases in eastern China. Results showed that the annual average CO (O) concentration in 2018 decreased by 2% (increased by 19%) when compared with that in 2015. CO concentrations exhibited monthly variability, peaking in February (443.