June 10, 2011 – A look at Boston’s Median CO₂ concentration (Feb 2010 – May 2011)

Below is a figure showing the CO₂ concentration (ppm) at Boston University from February 2010 through May, 2011. 在冬季，由于供暖和其他城市排放，浓度增加。 夏季由于植被的光合作用和生长，其浓度降低。

The background CO₂ concentration is measured at Mauna Loa, Hawaii and was an average of 394 ppm in May, 2011. In contrast, the average CO₂ concentration at BU was 405 ppm.