The line graph illustrates the rate of ozone in one area during a day in four years, from 1982 to 2012.
Overall, the ozone levels experienced different trends in the time period. While the rate rose with some fluctuations in 1982 and 1992, the indication of ozone increased sharply in 2002 and 2012.
As the graph shows, the proportion stayed standly after midnight in four different years. In 1982 and 1992, there was a gradual rise of ozone during one day, it started at about 50 micrograms and finished at just under 100 at the end of the day.
Regarding the amount of ozone in 2002 and 2012, there was a stability of levels after 12 p. m. By contrast, they grew sharply from about 53 micrograms at 6 a. m. to more than 250 micrograms at midday. Then, the levels dropped suddenly to over 150 micrograms in four hours after 12 a. m. At the end of the day, the layers of ozone in one city witnessed a decrease, the lines stood at over 100 micrograms.
The line graph illustrates the rate of ozone in one area during a day in four years, from 1982 to 2012.
Overall
, the ozone levels experienced
different
trends in the time period. While the rate rose with
some
fluctuations in 1982 and 1992, the indication of ozone increased
sharply
in 2002 and 2012.
As the graph
shows
, the proportion stayed
standly
after midnight in four
different
years. In 1982 and 1992, there was a gradual rise of ozone during one day, it
started
at about 50 micrograms and finished at
just
under 100 at the
end
of the day.
Regarding the amount of ozone in 2002 and 2012, there was a stability of levels after 12 p. m. By contrast, they grew
sharply
from about 53 micrograms at 6 a. m. to more than 250 micrograms at midday. Then, the levels dropped
suddenly
to over 150 micrograms in four hours after 12 a. m. At the
end
of the day, the layers of ozone in one city witnessed a decrease, the lines stood at over 100 micrograms.