Regional severe haze represents an enormous environmental problem in China, influencing
air quality, human health, ecosystem, weather, and climate. These extremes are …

Nitrate is an important component of atmospheric particulate matter and affects air quality,
climate, human health, and the ecosystem. Nitrate was previously considered a permanent …

Gaseous nitrous acid (HONO) is a critical source of hydroxyl radicals (OH) in the
troposphere. While both direct and secondary sources contribute to atmospheric HONO …

Nitrous acid (HONO) can strongly affect atmospheric photochemistry in polluted regions
through the production of hydroxyl radicals (OHs). In January 2017, a severe pollution …

In this study, continuous measurements of HONO and related parameters were carried out at
an urban site in Beijing during intense summer and winter campaigns. Highly variable …

Haze events in China megacities involve the rapid oxidation of SO2 to sulfate aerosol. Given
the weak photochemistry that takes place in these optically thick hazes, it has been …

Nitrous acid (HONO), an important precursor of the hydroxyl radical (OH), has long been
recognized as of significance to atmospheric chemistry, but its sources are still debated. In …

Ammonium salt is an important component of particulate matter with aerodynamic diameter
less than 2.5 µm (PM2. 5) and has significant impacts on air quality, climate, and natural …

HONO is an important precursor of OH radical and plays a key role in atmospheric
chemistry, but its source and formation mechanism remain uncertain, especially during …

Atmospheric nitrous acid (HONO) chemistry is of critical importance to air quality during
polluted haze events, especially in China. However, current air quality models (such as WRF …