The presented bar graph presents information about the comparison of air 
pollution
 Use synonyms
levels
 in the company of four countries in 2012, with a focus on three main Use synonyms
sources
: Use synonyms
electricity
 Use synonyms
generation
, Use synonyms
transport
 and Use synonyms
industry
.
Use synonyms
Overall
, China had the highest Linking Words
levels
 of air Use synonyms
pollution
 across all three Use synonyms
sources
, Use synonyms
while
 Australia had the lowest. Linking Words
Transport
 was the leading cause of Use synonyms
pollution
 in America, Use synonyms
whereas
 in Japan, Linking Words
industry
 was the primary contributor.
China experienced the most significant Use synonyms
pollution
 from Use synonyms
Use synonyms
industry
 at around 80 Add an article
the industry
PPM
, followed by Use synonyms
transport
 and Use synonyms
electricity
 Use synonyms
generation
, both exceeding 50 Use synonyms
PPM
. Use synonyms
In contrast
, America’s highest Linking Words
pollution
 source Use synonyms
was 
Change the verb form
was transported
transport
 at approximately 60 Use synonyms
PPM
, with Use synonyms
electricity
 Use synonyms
generation
 and Use synonyms
industry
 contributing less but still substantial Use synonyms
levels
.
Japan had the highest Use synonyms
pollution
 from Use synonyms
Use synonyms
industry
 at about 45 Add an article
the industry
PPM
, Use synonyms
while
 Linking Words
transport
 and Use synonyms
electricity
 Use synonyms
generation
 were lower, each below 30 Use synonyms
PPM
. Australia showed the least Use synonyms
pollution
, with all Use synonyms
sources
 contributing under 20 Use synonyms
PPM
, and Use synonyms
transport
 being the highest among them.
In summary, China and America had significant Use synonyms
pollution
 from specific Use synonyms
sources
, Use synonyms
whereas
 Japan and Australia had relatively balanced and lower Linking Words
pollution
 Use synonyms
levels
.Use synonyms