A small amount of nitrogen oxides will be produced in the air in thunderstorm weather.

Nitrogen will not react with oxygen under normal circumstances, but in the case of discharge or natural thunderstorm, it will generate a great voltage, and the triple bond of nitrogen will break and combine with oxygen to form NO.

NO is very unstable, and it is rapidly oxidized by oxygen into reddish-brown NO2 under natural conditions, and NO2 reacts with water to generate dilute nitric acid.

In some countries with abundant water resources, the synthesis of nitric acid by electric energy has the advantages of wide sources of raw materials and low cost.

Do you understand, landlord?