The chart illustrates the levels of air pollution in three major cities—City A, City B, and City C—between 2010 and 2020. Overall, while all three cities experienced fluctuations in pollution levels over the decade, City A had the highest levels throughout the period, whereas City C remained the least polluted.
In 2010, City A recorded the highest pollution level at approximately 80 micrograms per cubic meter (µg/m³). This figure remained stable until 2014, after which it gradually declined, reaching around 65 µg/m³ by 2020. This suggests that some measures may have been implemented to reduce pollution in this city.
City B, on the other hand, started with a pollution level of about 60 µg/m³, which was significantly lower than in City A. However, pollution levels in City B increased steadily between 2013 and 2017, peaking at 75 µg/m³. Despite a slight decline afterward, air pollution remained high at approximately 70 µg/m³ in 2020. This trend indicates worsening air quality over time.
City C consistently had the lowest pollution levels throughout the period. Beginning at 40 µg/m³ in 2010, pollution levels rose slightly to 50 µg/m³ in 2015 before gradually decreasing to 45 µg/m³ by 2020. This relatively stable trend suggests that City C experienced fewer pollution-related issues compared to the other two cities.
In summary, while air pollution in City A declined over time, it remained the most polluted. City B saw an overall increase, while City C had the least pollution with minor fluctuations.