ISSS608 2018-19 T1 Assign Yan Huilin

Task 1

Characterize the past and most recent situation with respect to air quality measures in Sofia City: 2013 has 2 days of heavily polluted days, about 10 days of medium polluted days, total polluted rate, medium. 2014 has 4 days of heavily polluted days, about 35 days of medium polluted days, total polluted rate, medium. 2015 has 6 days of heavily polluted days, about 45 days of medium polluted days, total polluted rate, high. 2016 has 1 days of heavily polluted days, about 1 days of medium polluted days, total polluted rate, very low. 2018 has 5 days of heavily polluted days, about 6 days of medium polluted days, total polluted rate, low. From 2013 to 2015, the polluted days increased, thus the pollution level became higher. In 2016 however, the concentration plumped, and there was very few polluted day across the year. In 2018, the polluted days increased a bit at the beginning of the year, but stayed modest-polluted to the middle of September.

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