The pictures illustrate the conditions of 
air
 pollution in Japan, China, Australia, and the USA caused by the usage of electricity generation, vehicles, and industrial activities. It can be clearly seen that Australia have the clearest Use synonyms
air
 compared to the rest, Use synonyms
while
, China is the most polluted country.
Three causes that Linking Words
polluting
 Wrong verb form
pollute
the 
Correct article usage
apply
Australias'
 Change noun form
Australia's
air
 Use synonyms
is
 relatively equal, which is less than 20 PPM. The power plants create a bit higher level than others. Correct subject-verb agreement
are
In addition
, the business industries lead the Linking Words
air
 pollution in China with 80 PPM. Use synonyms
The transportation
 Correct article usage
Transportation
make
 the pollution levelCorrect subject-verb agreement
makes