Development of a Photo-Fragmentation Laser Induced Floresence Instrument for the Measurement of Nitrous Acid

The hydroxyl radical (OH) is the primary oxidant in the atmosphere with its concentration determining the lifetime of many species and its reaction with volatile organic compounds (VOCs) leading to the production of secondary organic aerosols and tropospheric ozone. It is important, therefore, that the sources of OH are well understood. Nitrous acid (HONO) has been shown to be a dominant source of OH in urban regions, where daytime concentrations of HONO can reach several hundred pptv. Models, however, currently under-predict HONO concentrations in the day, indicating a missing HONO source

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