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The heterogeneous conversion ofNO2 on different secondary organic aerosols (SOA) was investigated with the focus on a possible formation of nitrous acid (HONO). In one set ofexperiments different organic aerosols were produced in the reactions of O3 withalpha-pinene, limonene or catechol and OH radicals with toluene or limonene, respectively. The aerosolswere sampled on filters and exposed to humidified NO2 mixtures under atmospheric conditions. The estimated upper limits for the uptake coefficients ofNO2 and the reactive uptake coefficients NO2 -> HONO are in the range of 10-6 and 10-7, respectively. Theintegrated HONO formation for 1 h reaction time was <1013 cm-2 geometrical surface and<1017 g-1 particle mass. In a second set of experiments the conversion ofNO2into HONO in the presence of organic particles was carried out in an aerosol flow tube under atmosphericconditions. In this case the aerosols were produced in the reaction of O3with beta-pinene, limonene or catechol, respectively. The upper limits for the reactive uptake coefficientsNO2-> HONO were in the range of 7 x 10-7 - 9 x 10-6. The results from the present study showthat heterogeneous formation of nitrous acid on secondary organic aerosols (SOA) isunimportant for the atmosphere

atmospheric chemistry and physics

Heterogeneous conversion of NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; on secondary organic aerosol surfaces: A possible source of nitrous acid (HONO) in the atmosphere?