The bar chart given illustrated the maximum and minimum amount of SO2 and N2O in the atmosphere of four big cities: Los Angeles, Calcutta, Beijing, and Mexico city daily in 2000.
Overall, the amount of N2O was much higher than that of SO2 in two cities in America, which was contrary to two Asian cities.
In Calcutta, the amount of two polluted gases was nearly equal as the maximum amount of SO2 and N2O was 59 and 52 micrograms per m3 respectively. Similarly, the minimum amount of those two polluted gases in Calcutta was 47 and 30 micrograms per m3, respectively. In Beijing, however, the amount of SO2 was 76 micrograms per m3 higher than that of N2O.
In Los Angeles, the amount of SO2 in atmosphere was much lower than other countries with the minimum of 2 micrograms per m3 and maximum of 10 micrograms per m3 while in Mexico city, the maximum and minimum amount of SO2 was 200 and 80 micrograms per m3 respectively and that of N2O was also the highest of four countries with 113 micrograms per m3 for minimum amount and 207 micrograms per m3 for maximum amount daily.