Are aerosol particles a source of HONO in the atmosphere?

Ajit Singh, Leigh Crilley, William Bloss and Francis Pope.

Nitrous acid (HONO) is an important source of the hydroxyl radical (OH) in the troposphere. However, the tropospheric sources of HONO are poorly constrained. The present work explores whether a significant source of HONO is generated via heterogeneous aerosol reactions. Towards these aims, a two week (18th March – 1st April 2015) field campaign was performed, where a range of atmospheric gas-phase (NOx, O3, HONO), particle phase species, meteorological and radiation parameters were measured at Elms Road Observing Station (EROS) an urban background monitoring station situated on the University of Birmingham campus.

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