Unexpectedly High Indoor HONO Concentrations Associated with Photochemical NO2 Transformation on Glass Windows,Environmental Science & Technology

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Unexpectedly High Indoor HONO Concentrations Associated with Photochemical NO2 Transformation on Glass Windows
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-11-24 , DOI: 10.1021/acs.est.0c05624
Jiangping Liu _{1,

2} , Huifan Deng _{1,

2} , Pascale S. J. Lakey ₃ , Haoyu Jiang ₁ , Majda Mekic _{1,

2} , Xinming Wang _{1,

4,

5} , Manabu Shiraiwa ₃ , Sasho Gligorovski _{1,

4,

5}

Affiliation

Nitrous acid (HONO) is an important gaseous pollutant contributing to indoor air pollution because it causes adverse health effects and is the main source of hydroxyl radicals (OH). Here, we present direct measurements of HONO produced through light-induced heterogeneous reactions of NO₂ with grime adsorbed on glass window. The uptake coefficients of NO₂ [γ(NO₂)] on the glass plates from the kitchen increased markedly from (2.3 ± 0.1) × 10^–6 at 0% RH to (4.1 ± 0.5) × 10^–6 at 90% RH. We report a significant quantity of daytime HONO produced in the kitchen, compared to the living room and bedroom. Kinetic modeling suggests that phase state and bulk diffusivity play important roles in the NO₂ uptake; the best fit to the measured uptake coefficients is obtained with fixed diffusion coefficients. Photon scattering may be occurring at the surface of the films, leading to enhanced photon-excitation rates of polycyclic aromatic hydrocarbons. By taking these effects into account, the results from this study indicate that the HONO yields obtained in this study can explain the missing HONO in the photochemical models describing the indoor air chemistry.

中文翻译：

与玻璃窗上的光化学NO ₂转化有关的室内HONO浓度异常高

亚硝酸（HONO）是导致室内空气污染的重要气体污染物，因为它会对健康造成不利影响，并且是羟自由基（OH）的主要来源。在这里，我们提出直接测量NONO的方法，该方法是通过NO ₂与吸附在玻璃窗上的污垢的光诱导异质反应产生的。厨房玻璃板上NO ₂ [γ（NO ₂）]的吸收系数从0％RH时的（2.3±0.1）×10 ^–6显着增加到90％RH时的（4.1±0.5）×10 ^–6。。与客厅和卧室相比，我们报告了厨房中白天产生的大量HONO。动力学建模表明，相态和体积扩散率在NO _2中起重要作用摄取在固定的扩散系数下，可以最佳地拟合所测量的吸收系数。薄膜表面可能发生光子散射，导致多环芳烃的光子激发速率提高。通过考虑这些影响，本研究的结果表明，本研究中获得的HONO产量可以解释描述室内空气化学的光化学模型中缺少的HONO。

更新日期：2020-12-15

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