What are the main sources of nitrogen oxides in the atmosphere?

Answer 1

Lightning and emissions from combustion engines

Localised areas of high temperatures allow atmospheric nitrogen and atmospheric oxygen to react and form nitrogen oxides, such as #NO# and #NO_2#.

#N_(2(g))+O_(2(g))->2NO_((g))#

Most #NO# formed typically further reacts with atmospheric #O_2# to form #NO_2#

#2NO_((g))+O_(2(g))->2NO_(2(g))#

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Answer 2

Henry Antrim

Nitrogen oxides (NOx) are mostly released into the atmosphere by combustion processes, such as those that occur in automobiles, power plants, factories, and wildfires.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.