The chart illustrates the average daily minimum and maximum levels of two air pollutants—SO2 and N2O in 2000 in four cities:Los Angeles, Calcutta, Beijing, and Mexico City.
Overall, the data highlights significant differences in pollution levels among the cities. Mexico City recorded the highest levels of both pollutants, while Los Angeles experienced relatively low levels of SO2 but middle N2O pollution.
In detail, the SO2 levels in Los Angeles were the lowest, with a minimum of only 2 micrograms and a maximum of 10 micrograms. The N2O concentrations were higher, ranging from 39 micrograms to 104 micrograms. Calcutta displayed moderately higher SO2 levels (47micrograms minimum and 59 micrograms maximum) compared to Los Angeles. Its N2O levels were fluctuating between 30 micrograms and 52 micrograms.
Beijing, meanwhile, had higher SO2 pollution, with minimum and maximum values of 25 micrograms and 100 micrograms. However, its N2O levels (14–54 micrograms) were similar to those of Calcutta. On the other hand, Mexico City experienced the highest pollution overall. SO2 levels ranged between 80 micrograms and 200micrograms, while N2O peaked at 207 micrograms, with a minimum of 113micrograms.