It does not burn in air but support combustion.
4Mg(s) 2NO2(g) 4MgO(s) + N2(g)
It acts as oxidizing agent
H2S(g) + NO2(g) H2O(L) + NO(g) + S(s)
It reacts with water
2NO2(g) + H2O(L) HNO3(aq) + HNO2(aq)
It reacts with alkalis
2KOH(aq) +2NO2(g) KNO3(aq) + KNO2(aq) + H2O(L)