The provided bar chart illustrates the information about the average daily minimum and maximum levels of air pollutants in 4 different cities in 2000. 
Overall
, it could be noticed that Mexico Linking Words
City
 hold the top in both minimum and maximum SO2 and N2O levels, Use synonyms
following
 by Beijing, Calcutta and Wrong verb form
followed
then
 Los Angeles during the whole surveyed period.
  Linking Words
According to
 the chart, Mexico Linking Words
City
 is the most air pollutant Use synonyms
city
, Use synonyms
80
 Change preposition
with 80
in 
minimum and 200 Change preposition
apply
in 
maximum SO2 Change preposition
apply
micrograms
 per m3, more than that of three other cities Use synonyms
plus 
together. Correct word choice
apply
In addition
, Los Angeles Linking Words
is seemed
 to be the most environment-friendly Wrong verb form
seems
city
, with only Use synonyms
average
 of about 6 Correct article usage
an average
micrograms
 per m3.
   Use synonyms
Besides
, the N2O Linking Words
pollutants
 level in Mexico Fix the agreement mistake
pollutant
City
 Use synonyms
still
 incomprehensibly high, approximately 150 Add a missing verb
is still
micrograms
 Use synonyms
While
 the least pollutant Linking Words
city
 in Use synonyms
this
 case came to Beijing, 14 and 54. Los Angeles was top 2 in N2O, between 39 and 104 Linking Words
micrograms
 respectively.Use synonyms