Nitrogen oxides (NO x= NO+ NO 2) are key precursors of tropospheric ozone (O 3) together
with volatile organic compounds (VOC) and carbon monoxide (CO). Since O 3 has positive …

Particulate nitrate (pNO 3−) has long been considered a permanent sink for NO x (NO and
NO2), removing a gaseous pollutant that is central to air quality and that influences the …

Wintertime in situ measurements of OH, HO 2 and RO 2 radicals and OH reactivity were
made in central Beijing during November and December 2016. Exceptionally elevated NO …

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 …

The Indian megacity of Delhi suffers from some of the poorest air quality in the world. While
ambient NO 2 and particulate matter (PM) concentrations have received considerable …

Nitrous acid (HONO) is a significant precursor of atmospheric “detergent” OH radicals and
plays a vital role in tropospheric chemistry. The current knowledge about daytime HONO …

As primary emissions have been declining in recent decades in China, secondary pollution,
like ozone (O 3) and secondary aerosols are main pollutants deteriorating air quality. The …

Abstract We compare Community Multiscale Air Quality (CMAQ) model predictions with
measured nitrous acid (HONO) concentrations in Beijing, China, for December 2015. The …

Nitrous acid (HONO) is one of the most important photochemical precursors of the hydroxyl
radical in the sunlit urban atmosphere. The sources of HONO, however, are still poorly …

Peroxyacetyl nitrate (PAN) is an important indicator for photochemical pollution, formed
similar to ozone in the photochemistry of certain volatile organic compounds (VOCs) in the …