New nitrogen dioxide (NO₂) retrieval algorithms are developed for Pandora zenith-sky measurements. A column-to-surface conversion look-up table was produced for the Pandora instruments; therefore, quick and practical Pandora-based surface NO₂ concentration data can be obtained for air quality monitoring purposes. It is demonstrated that the surface NO₂ concentration is controlled not only by the planetary boundary layer height but also by both boundary layer dynamics and photochemistry.