The diagram illustrates carbon dioxide concentrations in 4 various cities of Massachusetts, such as Boston, Worcester, Springfield and Cambridge, measured in mkg/m3, from 2000 to 2020. Overall, Springfield showed the highest trend among 4 cities over the period, while Boston ended up being the lowest.
In 2000, Springfield recorded the highest level at around 130 mkg/m3, while Boston was slightly less than Springfield, making up roughly 125 mkg/m3. Similiarly, Worcester was measured at more than 70 mkg/m3. In contrast, Cambridge was the lowest across four different cities, accounted for 72 mkg/m3.
In 2010, Springfield experienced a steady decrease from 130 mkg/m3 to approximately 71 mkg/m3 making up the lowest rate, while Cambridge increased sharply from 72 mkg/m3 to 140 mkg/m3 and was higher than the rest. Moreover, also Boston slightly increased to roughly 78 mkg/m3, in contrast, Worcester showed a little rise with 80 mkg/m3.
During 2020, Springfield showed the highest rate again at around 132 mkg/m3. compared to Springfield, Boston significantly dropped to 35 mkg/m3 making up the lowest CO2 concentration.
Meanwhile, Worcester followed the Springfield with 130 mkg/m3. Also, Cambridge recorded 90 mkg/m3 of carbon dioxide concentrations.