Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 54, Issue 18, Pages 11079-11086Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.0c02627
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Funding
- National Natural Science Foundation of China [41773131, 41977187]
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry [SKLOG2020-5]
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Polycyclic aromatic hydrocarbons (PAHs) as constituents of urban grime and indoor surfaces can impact the photochemical conversion of nitrogen dioxide (NO2) to nitrous acid (HONO) thereby impacting the oxidation capacity of the atmosphere. In this study we investigate the effect of relative humidity (RH%), light intensity, and NO2 concentrations on uptake coefficients (gamma) of NO2 on solid film consisting of fluorene (FL) and a mixture of FL and Na2SO4 as a proxy for urban and indoor grime at ambient pressure and temperature. gamma(NO2) on solid FL increased markedly from (5.7 +/- 1.7) x 10(-7) at 0% RH to (4.6 +/- 1.0) x 10(-6) at 90% RH. The NO2 to HONO conversion yield, (Delta HONO/Delta NO2)%, increases with RH from 40% at 0% RH up to 80% at 60-90% RH, indicating that the water molecules favor the formation of HONO up to 60% RH. These results suggest that the heterogeneous photochemical reaction of NO2 on FL and FL/Na2SO4 can be an important source of HONO in the urban environment and indoor atmosphere and should be considered in photochemical models.
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