The line chart illustrates the degrees of population based on two pollutants (sulphur dioxide and smoke) in the city of london from the years 1600 to 2000. The units are measured in micrograms per cubic metre.
Overall, Sulfur dioxide was in a higher quantity than smoke in all the years. The figure shows that the amount of sulfur dioxide and smoke was increasing for a period of time, and both decreased in a few years. The graph shows that the amount of sulfur dioxide was on a decline before the drop in smoke quantity.
Starting from around the year 1600, sulphur dioxide was about 125 just before increasing rapidly to a value in between 1000 and 750 in the year close to 1850. The concentration of sulphur dioxide decreased from almost 750 to just aboie 0 from the year around 1800 to 2000.
Beginning from 1600. quantity of smoke was barely above 0 and increased steadily to a small peak of about 500 . The graph then shows the line for smoke concentration have small fluctuations before decreasing to almost 0 in 2000.