美国环境保护机构（EPA）通过遍布全国城镇的很多战略放置的污染传感器密切注意空气污染。
The US Environmental Protection Agency (EPA) keeps tabs on air pollution through dozens of strategically placed pollution sensors in cities and towns throughout the country.
如果你有一个邻里组织，提出这个问题，并且问人们是否在使用美国环境保护机构认证的火炉，它比老火炉烧的更清洁。
If you have a neighborhood association, bring up the issue and ask if folks are using stoves certified by the U. s. Environmental Protection Agency, which burn more cleanly than older stoves.
如果你有一个邻里组织，提出这个问题，并且问人们是否在使用美国环境保护机构认证的火炉，它比老火炉烧的更清洁。
If you have a neighborhood association, bring up the issue and ask if folks are using stoves certified by the U. s. Environmental Protection Agency, which burn more cleanly than older stoves.
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