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

The bar chart delineates the average amount of contamination released into the

air

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in four countries namely China, America, Japan and Australia in 2012

Overall

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, it was witnessed that industry was the main cause of

air

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pollution in four surveyed countries.

Moreover

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, China was the most polluted nation throughout the period. More specifically, it was clear to see that industrial development was the key source that led to

air

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contamination in China in 2012 with 90

PPM

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, followed by transportation and electricity generation with 70

PPM

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and 60

PPM

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, respectively.

By contrast

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, in America, the emissions from means of transport seemed like the main cause of

air

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pollution with 60

PPM

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, lower than that were the electricity generation and industry with only half than that. Relating to the remaining features, industrial zones were the crucial factor that polluted the

air

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in Japan, with more than 40

PPM

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,

besides

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that, transportation held second with lower than 10

PPM

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and the

last

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was electricity generation. In Australia, it was likely that the levels of

air

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pollution were gradually caused by all these three factors with nearly 20

PPM

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in 2012