The Chart Below Shows the Average Daily Minimum and Maximum Levels of Two Air Pollutants in Four Big Cities in 2000

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 making comparisons where relevant. The chart illustrates the average daily minimum and maximum levels of two air pollutants: sulphur dioxide and nitrous oxide, […]