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。

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。

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。

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。

So, in a polluted city, we might find high concentrations of nitrogen dioxide because of all the traffic-it's not great for our health, Sam.

所以在一个被污染的城市里，我们可能会因为交通而发现高浓度的二氧化氮——这对我们的 不利，萨姆。

One of the things that we found in our study was that cities that had higher nitrogen dioxide levels also had higher greenhouse gases.

我们在研究中还发现一件事，即二氧化氮含量较高的城市，其温室气体含量也更高。

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。

The readings of PM2.5, PM10, nitrogen dioxide and sulfur dioxide were all at their lowest levels for the same five-month period since records began in 2013.

PM2.5、PM10、二氧化氮和二氧化硫的读数都是 2013 年有记录以来同一时期的最低水平。

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。

So, one we've been talking about is nitrogen dioxide, which is linked to all of those health effects that I described, especially asthma.

因此，我们一直在谈论的一个是二氧化氮，它与我描述的所有健康影响有关，尤其是哮喘。

Other risk factors for chronic bronchitis include exposure to air pollutants like sulfur and nitrogen dioxide, exposure to dust and silica, as well as genetic factors like having a family history of chronic bronchitis.

慢性支气管炎的其他致病因素包括空气污染物，例如硫和二氧化氮、暴露于灰尘和硅土，当然还有遗传因素，例如有慢性支气管炎的家族史。