. The chart shows the average daily minimum and maximum levels of air pollutants in 4 cities in 2000

The bar chart illustrates the medium min and max amount of SO2 and N2O every day in 4 big cities (Los Angeles, Calcutta, Beijing and Mexico City) in the year 2000. It can be seen that Mexico was the most polluted by the two poisons in the four cities.
Looking at the chart, in Los Angeles, the quantity of SO2 emanated the air was the littlest of all cities, with a min average of 2 (micrograms per m3) and a max median fivefold as much. The levels of N2O emissions were higher with the max median level up to over 100 ( micrograms per m3 ). Meanwhile, the sky of Mexico city experienced massive emission by SO2 and NO2 with the daily min median of 80 and 113 (micrograms per m3) respectively.
Contrary to LA and Mexico City, the amount of N2O in Calcutta and Beijing was less than by SO2. The daily median peak figures for SO2 pollutants were 59 (micrograms per m3) in Calcutta and 130 (micrograms per m3) in Beijing whereas the median peak figures for N2O were over 50 (micrograms per m3) in both cities.