Measurement of heterogeneous uptake of NO2 on inorganic particles, sea water and urban grime

Heterogeneous reactions of NO2 on different surfaces play an important role in atmospheric NOx removal and HONO formation, having profound impacts photochemistry polluted urban areas. Previous studies have suggested that the uptake ground or aerosol could be a dominant source for elevated during daytime. However, behavior varies with surfaces, coefficients were used derived studies. To obtain more holistic picture heterogeneous series laboratory experiments using flow tube reactors was conducted, (?) determined inorganic particles, sea water grime. The results showed those generally weak dark conditions, measured ? varied from <10?8 to 3.2 × 10?7 under humidity. A photo-enhanced grime observed, obvious formation NO reaction. 1.9 10?6 at 5% relative humidity (RH) 5.8 70% RH grime, showing positive dependence both formation. demonstrate daytime NO2-to-HONO conversion, helpful explain unknown area.