Measurements (Bertram and Thornton, 2009 Brown et al., 2009 Z. WangĮt al., 2017 Wang and Lu, 2016). The first is that the N 2O 5 heterogeneous uptake coefficient ( γ) on ambient aerosol is highly varied, with a rangeįrom 10 −4 to 10 −1 based on previous lab and field However, two problems remainĪmbiguous in quantifying the contribution of N 2O 5 uptake to Through NO 2 + NO 3 (Reaction 3), and there exists a quick thermal equilibrium balance ( K eq = 5.5 × 10 - 17 cm −3 molec. Night, N 2O 5 uptake is a vital nitrate formation pathway (Reaction 4) (Chen et al., 2020 Wang et al., 2022). Precursor concentrations as well as the gas-particle partition of gaseous nitric acid, and particulate nitrate depends on temperature, relative humidity (RH), NH 3 concentration, and aerosol acidity (Wang et al.,Ģ009 Song and Carmichael, 2001 Meng et al., 2020 Zhang et al., 2021). The product (HNO 3) reacts with alkaline substances in aerosol, Radical oxidation (Reaction 1) is the major particulate nitrate formation Mechanisms, and a basic framework has been established (Sun et al., 2006 Ĭhang et al., 2018 Wu et al., 2019). Massive research has been done in China to investigate nitrate formation Therefore, aĬomprehensive understanding of the particulate nitrate formation mechanism is essential and critical for mitigating haze pollution in China. NO 2, and PM 2.5 concentrations in China, while the inorganic nitrate ratio in PM 2.5 increased and became the considerable component in Since the Air Pollution PreventionĪnd Control Action Plan, there has been a significant decrease in SO 2,
The past 20 years, and secondary inorganic aerosol is regarded as one of the dominant species in aerosol (Cao et al., 2012 Hagler et al., 2006 Model simulation and call for more attention to nitrate pollution in theĬhemical compositions of fine particles have been measured in China during Nitrate pollution mechanisms and mitigation based on field observation and Is adequate for mitigating the O 3 and nitrate pollution coordinately during summertime in this region. Which indicated that the O 3-targeted scheme (VOCs : NO x = 2:1) The updated observed-constraint Empirical Kinetic Modeling Approach (EKMA) was used to assess the kineticĬontrolling factors of both local O 3 and NO 3 - productions, It was found that OH + NO 2 during daytime dominated nitrate formation on clean days, while N 2O 5 hydrolysis vastlyĮnhanced and became comparable with that of OH + NO 2 during pollutedĭays (67.2 % and 30.2 %, respectively). This study's high nitrate oxidation ratio (NOR)Įmphasized the solid atmospheric oxidation and fast nitrate formationĬapacity in the YRD. The heavy nitrate pollution in eastern China happened not only in winter, but also in summer. PM 2.5, followed by the proportion of sulfate, ammonium, and chloride byĢ6.0 %, 18.0 %, and 2.0 %, respectively. We showed a high NO 3 - mass concentration withġ0.6 ± 8.9 µg m −3 on average, which accounted for 38.3 % of total water-soluble particulate components and 32.0 % of total The concentrations of NO 3 -, OH radicals, N 2O 5, NO 2, O 3, and relevant parameters were measured simultaneously. (YRD) was conducted from May to June 2019 at a regional site in Changzhou, HereĪ comprehensive field campaign that focuses on the atmospheric oxidationĬapacity and aerosol formation and their effects in the Yangtze River Delta Particulate nitrate (NO 3 - ) is one of the dominant components of fine particles in China, especially during pollution episodes,Īnd has a significant impact on human health, air quality, and climate.
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