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Air quality differs from place to place and day to day. But about 99 percent of the world’s population breathes air at some point that does not meet pollution guidelines set by the World Health Organization (WHO).

空气质量每天都有不同的位置。 但是，在某个时候，大约99％的人口呼吸着空气不符合世界卫生组织（WHO）制定的污染指南。

Different forms of air pollution kill about 7 million people each year, the U.N. health agency estimates. But health experts say there are some actions individuals can take to protect themselves, even in the world’s most polluted cities.

联合国卫生局估计，每年不同形式的空气污染杀死约700万人。 但是健康专家说，即使在世界上最污染的城市中，个人也可以采取一些行动来保护自己。

The first step is to start with the understanding that air is not only polluted when it looks smoky or smoggy, said Tanushree Ganguly. She is an air quality expert with the Energy Policy Institute of Chicago’s India program.

Tanushree Ganguly说，第一步是从了解空气时不仅在看起来烟熏或烟雾时受到污染的第一步。 她是芝加哥印度能源政策研究所的空中质量专家。

“Blue skies can’t guarantee you clean air,” Ganguly told The Associated Press.

“蓝天不能保证您清洁空气，”甘加利对美联社说。

Air pollutants often come from people burning things. Examples include fuels as well as clearing operations involving crops or trees. Pollutants can also be released from wildfires.

空气污染物通常来自燃烧东西的人。 例子包括燃料以及涉及农作物或树木的清理操作。 污染物也可以从野火中释放出来。

Among the most dangerous particles we can breathe in are called particulate matter. The smallest of these are known as PM 2.5. This is because they are less than 2.5 microns in diameter. These particles can travel deep inside human lungs and are mostly created by burning fuels. Larger particles, known as PM 10, are linked to agriculture, roadways, mining or wind-blown dust.

在我们可以呼吸的最危险的颗粒中，称为颗粒物。 其中最小的被称为PM 2.5。 这是因为它们的直径小于2.5微米。 这些颗粒可以在人类肺部深处传播，并且主要是由燃烧燃料产生的。 较大的颗粒（称为PM 10）与农业，道路，采矿或风吹灰尘有关。

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