The other pollutant that’s more recently become an issue is nitrogen dioxide, again largely from diesel.”

近日，同样成为问题的污染物还包括二氧化氮，二氧化氮多半也来自柴油机。”

One gas that NACHOS will search for is nitrogen dioxide, which often comes from burning fossil fuels.

NACHOS会探测二氧化氮，它通常来自燃烧化石燃料。

So, in a polluted city, we might find high concentrations of nitrogen dioxide because of all the traffic.

所以，在一个被污染的城市，我们可能会发现高浓度的二氧化氮，全是因为交通。

We measure with our device six different pollutants: carbon monoxide, carbon dioxide, ozone, PM 2.5, nitrogen dioxide and nitrogen monoxide.

一氧化碳、二氧化碳、臭氧、PM2。5、二氧化氮和一氧化氮化合物。

And we're also prodigious emitters of nitrogen dioxide and methane.

我们也是二氧化氮和甲烷的巨大排放者。

They let off pollutants like nitrogen dioxide and carbon monoxide.

它们释放出二氧化氮和一氧化碳等污染物。

It found that 97 % of the entire population was exposed to dangerous levels of pollutants, including particulates, nitrogen dioxide and ozone.

研究发现，97%的人口暴露在危险水平的污染物中，包括颗粒物、二氧化氮和臭氧。

So, the Consumer Product Safety Commission asked the EPA about the effects of pollutants like nitrogen dioxide.

因此，消费品安全委员会向美国环保局询问二氧化氮等污染物的影响。

In January of 2016, London took just over one week to reach its own annual limits of nitrogen dioxide.

2016 年 1 月，伦敦仅用了一周多的时间就达到了自己的年度二氧化氮限值。

Although there are many types of emissions, such as from factories, these zones predominantly target exhaust fumes from vehicles, poisonous gases called nitrogen dioxide.

尽管排放的类型有很多，比如来自工厂，但这些区域主要针对车辆排放的废气，一种叫做二氧化氮的有毒气体。