The chart below shows the average daily minimum and maximum levels of two air pollutants in four big cities in 2000. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The chart below shows the average daily minimum and maximum levels of two air pollutants in four big cities in 2000.
Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The bar chart illustrates the average daily minimum and maximum concentrations of sulphur dioxide (SO₂) and nitrous oxide (N₂O) in four major cities—Los Angeles, Calcutta, Beijing, and Mexico City—during the year 2000.
Mexico City recorded the highest pollution levels for both SO₂ and N₂O, whereas Los Angeles exhibited the lowest SO₂ concentrations. Beijing showed the greatest fluctuation in SO₂ levels, while having the lowest N₂O levels among the cities. Calcutta presented moderate pollution levels compared to the other cities.
Los Angeles experienced the lowest SO₂ levels among the cities, ranging from 2 µg/m³ to 10 µg/m³. In contrast, Calcutta reported significantly higher SO₂ concentrations, varying between 47 µg/m³ and 59 µg/m³. Beijing displayed considerable disparity in SO₂ levels, with a minimum of 25 µg/m³ and a maximum of 130 µg/m³, indicating substantial daily variations. Mexico City exhibited the highest SO₂ pollution, ranging from 80 µg/m³ to 200 µg/m³.

Regarding N₂O levels, Los Angeles showed relatively elevated concentrations, ranging from 39 µg/m³ to 104 µg/m³. Calcutta reported lower N₂O levels compared to Los Angeles, with values ranging from 30 µg/m³ to 52 µg/m³. Beijing had the lowest N₂O concentrations, varying between 14 µg/m³ and 54 µg/m³. Mexico City reported the highest N₂O levels, with values ranging from 113 µg/m³ to 207 µg/m³.

Mexico City stands out as the most polluted city among the four, showing elevated levels of both pollutants. Los Angeles, despite having the lowest SO₂ levels, exhibits relatively high N₂O concentrations compared to Calcutta and Beijing. Beijing, in terms of N₂O, demonstrates the best air quality among the cities, although its SO₂ levels indicate significant daily fluctuations. Calcutta's pollution levels fall between those of Los Angeles and Mexico City, with more stable readings compared to Beijing

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