The graph below shows the pollution levels in London between 1600 and 2000.Summarise the information by selecting and reporting the main features, and make comparisons where relevant.Write at least 150 words.

The line chart compares and contrasts information on the changes in the pollution concentrations of two gases namely smoke and sulfur dioxide in London, over a four-century period of time, measured by micrograms per cubic metre.

Generally speaking, despite fluctuations, the concentration of two pollutants ended unchanged through the same interval of time.

A closer look at the diagram shows a slight increase in the concentration of smoke at roughly 250 micrograms per cubic metre which was only less than one-third of the concentration of sulfur dioxide in the first century. Both categories experienced a gradual fall in the next 25 years, followed by a significant upward trend and reached their peaks at 400 and 900 in 1825 and 1800 respectively. However, after hitting its peak at 550 micrograms per cubic metre in 1930, the amount of sulfur dioxide had a tendency of falling, followed by a stability at 250 through 25 years. On the other hand, 1950 witnessed the lowest point for smoke in 1940, then fell to approximately the same as that of sulfur dioxide in the last 60 years.

Votes
Average: 7.8 (1 vote)
Essays by the user:

Grammar and spelling errors:
Line 1, column 174, Rule ID: PERIOD_OF_TIME[1]
Message: Use simply 'period'.
Suggestion: period
... dioxide in London, over a four-century period of time, measured by micrograms per cubic metre...
^^^^^^^^^^^^^^

Transition Words or Phrases used:
first, however, if, look, then, third, on the other hand

Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments

Performance on Part of Speech:
To be verbs : 1.0 7.0 14% => More to be verbs wanted.
Auxiliary verbs: 0.0 1.00243902439 0% => OK
Conjunction : 5.0 6.8 74% => OK
Relative clauses : 2.0 3.15609756098 63% => OK
Pronoun: 3.0 5.60731707317 54% => OK
Preposition: 35.0 33.7804878049 104% => OK
Nominalization: 5.0 3.97073170732 126% => OK

Performance on vocabulary words:
No of characters: 913.0 965.302439024 95% => OK
No of words: 182.0 196.424390244 93% => More content wanted.
Chars per words: 5.01648351648 4.92477711251 102% => OK
Fourth root words length: 3.67297393991 3.73543355544 98% => OK
Word Length SD: 2.97319770632 2.65546596893 112% => OK
Unique words: 110.0 106.607317073 103% => OK
Unique words percentage: 0.604395604396 0.547539520022 110% => OK
syllable_count: 268.2 283.868780488 94% => OK
avg_syllables_per_word: 1.5 1.45097560976 103% => OK

A sentence (or a clause, phrase) starts by:
Pronoun: 0.0 1.53170731707 0% => OK
Article: 4.0 4.33902439024 92% => OK
Subordination: 1.0 1.07073170732 93% => OK
Conjunction: 0.0 0.482926829268 0% => OK
Preposition: 4.0 3.36585365854 119% => OK

Performance on sentences:
How many sentences: 6.0 8.94146341463 67% => Need more sentences. Double check the format of sentences, make sure there is a space between two sentences, or have enough periods. And also check the lengths of sentences, maybe they are too long.
Sentence length: 30.0 22.4926829268 133% => The Avg. Sentence Length is relatively long.
Sentence length SD: 35.0875888155 43.030603864 82% => OK
Chars per sentence: 152.166666667 112.824112599 135% => OK
Words per sentence: 30.3333333333 22.9334400587 132% => OK
Discourse Markers: 9.33333333333 5.23603664747 178% => OK
Paragraphs: 3.0 3.83414634146 78% => More paragraphs wanted.
Language errors: 1.0 1.69756097561 59% => OK
Sentences with positive sentiment : 3.0 3.70975609756 81% => OK
Sentences with negative sentiment : 1.0 1.13902439024 88% => OK
Sentences with neutral sentiment: 2.0 4.09268292683 49% => OK
What are sentences with positive/Negative/neutral sentiment?

Coherence and Cohesion:
Essay topic to essay body coherence: 0.0735219603891 0.215688989381 34% => OK
Sentence topic coherence: 0.0364303228541 0.103423049105 35% => OK
Sentence topic coherence SD: 0.0221071671111 0.0843802449381 26% => Sentences are similar to each other.
Paragraph topic coherence: 0.0498613771363 0.15604864568 32% => OK
Paragraph topic coherence SD: 0.0151816058397 0.0819641961636 19% => Paragraphs are similar to each other. Some content may get duplicated or it is not exactly right on the topic.

Essay readability:
automated_readability_index: 17.4 13.2329268293 131% => OK
flesch_reading_ease: 49.49 61.2550243902 81% => OK
smog_index: 11.2 6.51609756098 172% => OK
flesch_kincaid_grade: 13.8 10.3012195122 134% => OK
coleman_liau_index: 12.43 11.4140731707 109% => OK
dale_chall_readability_score: 9.12 8.06136585366 113% => OK
difficult_words: 46.0 40.7170731707 113% => OK
linsear_write_formula: 15.0 11.4329268293 131% => OK
gunning_fog: 14.0 10.9970731707 127% => OK
text_standard: 14.0 11.0658536585 127% => OK
What are above readability scores?

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Rates: 78.6516853933 out of 100
Scores by essay e-grader: 7.0 Out of 9
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Note: the e-grader does NOT examine the meaning of words and ideas. VIP users will receive further evaluations by advanced module of e-grader and human graders.