Abstract: This article mainly analyze urban air quality present situation in China and the key factors affecting urban air quality study.

摘要：本文针对我国城市的空气质量现状及影响城市空气质量的主要因素进行分析研究。

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This study did not provide a calculation for the lives saved in the non-cycling population but it stands to reason that they would also benefit from the improved air quality.

这项研究没有提供数据表明这一计划挽救了多少那些不骑车的人的生命，但是很显然，他们也同样受益于空气质量的改善。

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The World Health Organization study on urban air quality says those most affected live in the world's poorest cities.

世界卫生组织对城市空气质量的研究指出，受影响最严重的是全球最贫穷城市的居民。

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The American Lung Association's study ranks the air quality of 900 counties and more than 200 U.S. Census-defined Metropolitan Statistical Areas and Combined Statistical Areas--cities and their surrounding suburbs--where an air pollution monitor is present.

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They included physicians per capita, air quality, quality-of-aging metrics drawn from another Milken Institute study, and crime rates.

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The insight comes from a study looking at London's air quality records.

BBC: London's clue to stubborn ozone levels