The existence life of nitrous oxide in the atmosphere is about 150 years. Although it is chemically inert in the troposphere, the photolysis of solar radiation can be used to decompose 90% of it in the stratosphere and the remaining 10% It can be consumed by reacting with active atomic oxygen O(1D). Even so, the N2O in the atmosphere still increases at a rate of 0.5-3Tg per year.
N2O+hv→N2+O(1D)
N2O+O（1D)→N2+O2
N2O+O（1D)→2NO