The tube is blanketed in an inert gas such as nitrogen or argon.

管子被整个地漫浸在流动的氮或氩等惰性气体中。

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Nutrient pollution, such as nitrogen pollution, from lower latitudes may float north and promote algal growth in the Arctic.

低纬度地区的营养物污染，如氮污染，可能会漂向北部，促进北极藻类的生长。

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For decades, the Chesapeake has been plagued by excess nutrients, such as nitrogen, from agricultural and municipal run-off.

在过去的几十年里，切萨皮克湾一直被过营养化问题所困扰，比如来自农业生产和城市生活排放的氮素。

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These include the exhaust gases such as nitrogen oxides (NOx), non-methane volatile organic compounds (NMVOCs), and carbon monoxide (CO).

BBC: London's clue to stubborn ozone levels

For decades, discharges by wastewater treatment plants and land runoff have led to excessive levels of nutrients such as nitrogen and phosphorus in Long Island Sound.

WSJ: Connecticut Seaweed: Life Down on the Kelp Farm

The new rules will require automakers to roll out passenger cars and trucks that will reduce smog-producing pollutants such as nitrogen oxides by 75 percent less from the 2014 levels.

FORBES: California Sets New Rules To Boost Zero-Emission Car Sales