The chart shows air pollution levels among four countries in 2012. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The bar chart illustrates the three major causes - industry,

transportation

and electricity - of gas emissions of four countries, namely China, America, Japan and Australia, in the year 2012, measured in parts per million (

PPM

).

Overall

,

it is clear that

the industrial factor was the major cause of poor

air

quality

in China and Japan,

while

pollutants from

transportation

and electricity generation were the major sources in America and Australia.

According to

the data, the Chinese and the Japanese experience bad

air

quality

which is mainly caused by their countries' factory activities, contributed by 80

PPM

and around 41

PPM

, respectively. The other causes of

air

pollution in the two Asian countries,

such

as emissions from

transportation

and electric tool usage, contributed

by

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70

PPM

and approximately 59

PPM

in China and 30

PPM

and around 15

PPM

in Japan.

On the other hand

, most of the factors behind the decreasing

quality

of

air

in America

was

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were

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due to

their people's mobilization using

transportation

, which occurred to emit about 59

PPM

of

air

pollutants

as

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at

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their highest level,

while

the greenhouse gases generated from industrial and electrical usage were each about half of that amount.

Furthermore

, Australia is the country with the best

air

quality

for its people, compared with the other nations provided in the figure, where all

the

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three major factors of

air

pollutants only contributed by around 20

PPM

each.