The chart shows information about the 
pollution
 levels in the Use synonyms
air
 caused by Use synonyms
electricity
 generation, transport, and industry in four countries, namely China, America, Japan, and Use synonyms
Australia
, in 2012. Use synonyms
Overall
, Linking Words
industries
 are the largest source of Use synonyms
pollution
. Meanwhile, Use synonyms
electricity
 was the smallest, except in Use synonyms
Australia
.
In China, the Use synonyms
air
 Use synonyms
pollution
 caused by Use synonyms
industries
 reached 80 Use synonyms
ppm
, which is the highest level of Use synonyms
pollution
 caused by Use synonyms
industries
 in the period. Followed by transport and Use synonyms
electricity
, reaching 70 Use synonyms
ppm
 and around 60 Use synonyms
ppm
, respectively. In America, the highest Use synonyms
pollution
 source was transportation, Use synonyms
that
 reached slightly under 60 Correct pronoun usage
which
ppm
, followed by Use synonyms
electricity
 generation and industry around 30 Use synonyms
ppm
. 
In Japan, the largest amount of Use synonyms
air
 Use synonyms
pollution
 was caused by Use synonyms
industries
, same as in China, but at different levels (in Japan, slightly over 40 Use synonyms
ppm
). Followed by transport (30 Use synonyms
ppm
) and Use synonyms
electricity
  (around 15 Use synonyms
ppm
). Meanwhile, in Use synonyms
Australia
, the amount of Use synonyms
air
 Use synonyms
pollution
 caused by industry, Use synonyms
electricity
, and transportation Use synonyms
were
 under 20 Change the verb form
was
ppm
. Use synonyms
In addition
, in Linking Words
Australia
, the Use synonyms
pollution
 caused by Use synonyms
electricity
 was the largest amount.Use synonyms