Severe haze pollution occurs frequently in the winter over the Bei**g-Tian**-Hebei (BTH)
region (China), exerting profound impacts on air quality, visibility, and human health. The …

Volatile organic compounds (VOCs) are an important precursor of ozone (O 3) and
secondary organic aerosols (SOA), which play vital roles on affecting the climate and human …

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) is a major precursor of tropospheric hydroxyl radical (OH) that
accelerates the formation of secondary pollutants. The HONO sources, however, are not well …

Zhengzhou is one of the most haze-polluted cities in Central China with high organic carbon
emission, which accounts for 15%-20% of particulate matter (PM 2.5) in winter and causes …

Co-occurrences of high concentrations of PM 2.5 and ozone (O 3) have been frequently
observed in haze aggravating processes in the North China Plain (NCP) over the past few …

During haze periods in the North China Plain, extremely high NO concentrations have been
observed, commonly exceeding 1 ppbv, preventing the classical gas-phase H2O2 formation …

Secondary aerosols are a major component of PM 2.5, yet their formation mechanisms in the
ambient atmosphere are still unclear. Based on field measurements in downtown Bei**g …

Nitrous acid (HONO) plays an important role in the budget of hydroxyl radical (• OH) in the
atmosphere. Vehicular emissions are a crucial primary source of atmospheric HONO, yet …

In the summer of 2018, a comprehensive field campaign, with measurements on HONO and
related parameters, was conducted at the foot (150 m asl) and the summit of Mt. Tai (1534 m …