The charts shows air pollution levels by different causes among four countries in 2021. Summaries the information by selecting and reporting the main features, and make comparisons where relevant.

The given bar chart compares the

air

pollutant factors in four highly developed countries:

China

, America, Japan, and Australia in the given period of 2021. It can be seen that

,

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fumes released by transportation

was

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were

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the biggest

contribution

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contributor

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to

degradation

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the degradation

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of

quality

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the quality

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of

air

, following industrial and electricity generation, among

four

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the four

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countries. At first glance, compared to the other nations,

China

's CO2 emission level peaked in all categories,

for instance

, the industry released toxic fumes peaked at 80

ppm

, following, transportation and electricity generated CO2 was almost lower than 10

ppm

, respectively. A similar trend can be shown in Japan, but its industry fumes were just over 40

ppm

, which almost halved

China

's figure. In terms of the USA, the contributing factor of

air

pollution was fairly different, CO2 generation from vehicles was the largest just below

at

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60 pm, other two factors were equal at 30ppm and just below. Turning to Australia, where the

air

pollution level was the lowest, all causing factors were just below 20

ppm

, which is almost equal

in

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to

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one-

third

of

China

's features.