This paper provides a novel method to obtain a global and accurate photodissociation coefficient for NO₂ (J(NO₂)) based on satellite data, and the results are shown to be consistent with model results. The J(NO₂) value decreases as the solar zenith angle increases and has a weak altitude dependence. A key finding is that the satellite-derived J(NO₂) increases in the polar regions, in good agreement with model predictions, due to the effects of ice and snow on surface albedo.