It has been trying out monitoring stations that are intended to yield minute-to-minute maps of outdoor air pollution.

它一直在尝试建立监测站，以生成精确至分钟的室外空气污染分布图。

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Around 9 in 10 people in low-and middle-income countries live in places where they regularly experience dangerous levels of outdoor air pollution.

在低收入及中等收入国家，大约十分之九的人生活在室外空气污染经常达到危险程度的地方。

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Database: outdoor air pollution in cities.

数据库：城市室外空气污染。

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They found that indoor air pollution causes pulmonary diseases that kill an estimated Outdoor air pollution accounts for another 470 thousand deaths.

VOA: standard.2010.04.07

Outdoor air pollution is at its lowest level in 30 years.

CNN: Challenges ahead for a changing Earth

Yet, despite all the evidence implicating both indoor and outdoor air pollution's harmful impact on public health, we still have so much to do to clean up our act.

WHITEHOUSE: Energy and Environment Latest News | The White House

Because of the smoke, ash and winds, people in affected areas were urged to be cautious and to avoid unnecessary outdoor activities, the Ventura County Air Pollution Control District said.

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