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As is symbolically revealed in the picture, the situation of air pollution is worsening.
We can see clearly that coal burning has brought about great hazards to the city.

第三句引出图画的寓意，即文章的主题。
*句子剖析：as引导非限制定语从句，句子主干为the situation…is worsening.
第四句是段落总结句，归纳出煤炭为燃料的烟囱是环境污染的主要原因。
*句子剖析：句子主干是we can see that…。That 引导see的宾语从句。
*bring about造成，带来

For one thing, due to planning mistakes, factories were usually placed in center of cities, among residential and business districts and produced harmful smoke which contains poisonous gases.
For another, the number of such chimneys has a lot to do with air pollution: nearly every block has several chimneys for the heating system, which makes the whole city immersed in thick smoke.
As a result, respiratory diseases have been reported to be rising and old people dying of the worsening air pollution.

第四句回应本段第一句，总结城市污染造成的后果。
*句子剖析：这是一个由and连接的并列复合句。
*die of 死于…

In order to improve the situation, we have to take positive measures.
For one thing, factories with chimneys should be moved out of the center of the city and it should be made sure the waste gases are at least not poisonous.
For another, other means of heating should be developed to stop using coal.
Only in this way, can we find a way out and could people be happier and healthier.

第三句提出第二项建议。
*stop doing…
第四句是本段的总结句，提出建议措施的必要性。
*句子剖析：Only表示“只有”在句首，后面的主句主谓倒装。

第三句提出第二项建议。第四句是本段的总结句，提出建议措施的必要性。句子剖析：表示“只有”在句首，后面的主句主谓倒装。