It depends on the area of interest and application, the usefulness of this dual-faced molecular compound is enormous including, food preservation, synthesis of Nitric acid, fertilizer, explosives, environmental pollutants such as acid rains and likes.

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Nitric Oxide reacts with Ozone (O3) present in the atmosphere and gets converted to NO2 and O2.

NO + O3 --> NO2 + O2

Further NO2 splits in the presence of sunlight and gets converted to Nitric Oxide and O.

NO2 + hv --> NO + O

Atmospheric oxygen reacts with O to generate O3. This dynamic reaction continues during day time only in the presence of strong sunlight.

Because it causes mental illness