Articles | Volume 20, issue 8
Atmos. Chem. Phys., 20, 5071–5092, 2020
https://doi.org/10.5194/acp-20-5071-2020

Special issue: In-depth study of air pollution sources and processes within...

Atmos. Chem. Phys., 20, 5071–5092, 2020
https://doi.org/10.5194/acp-20-5071-2020

Research article 29 Apr 2020

Research article | 29 Apr 2020

High-resolution vertical distribution and sources of HONO and NO2 in the nocturnal boundary layer in urban Beijing, China

Fanhao Meng et al.

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Cited articles

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Short summary
Nitrous acid (HONO), a major precursor of the OH radical, plays a key role in atmospheric chemistry, but its sources are still debated. The first high-resolution vertical measurements of HONO and NO2 were conducted in Beijing to investigate the nocturnal sources of HONO at different stages of pollution. The ground surface dominated HONO production by heterogeneous conversion of NO2 during clean episodes, but the aerosol production was an important nighttime HONO source during haze episodes.
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