環境条件の異なる屋内外気相亜硝酸の評価と影響因子

Evaluation and impact factors of indoor and outdoor gas-phase nitrous acid under different environmental conditions.

• Yan Chen
• Weigang Wang
• Chaofan Lian
• Chao Peng
• Wenyu Zhang
• Junling Li
• Mingyuan Liu
• Bo Shi
• Xuefei Wang
• Maofa Ge

抄録

重要な室内汚染物質である亜硝酸（HONO）は、室内環境に浸透した太陽光を介した光分解により室内OHラジカル濃度に寄与し、室内の酸化能力に影響を及ぼす可能性がある。そこで、室内HONO濃度とその影響因子を調べるために、都市部と郊外の異なる3つの室内環境と2つの場所を選択し、HONO、NO、窒素酸化物（NO）、O、粒子質量濃度を含む室内外の汚染物質を同時にモニタリングした。一般的に、屋内HONOの濃度は屋外よりも高かった。都市部では、平均濃度が7.10ppbVと高い室内HONOが気温とよく相関していた。郊外では、室内HONO濃度は1〜2ppbV程度であり、室内相対湿度との相関性が高かった。これは主に室内表面でのNOの不均一反応に起因するものであった。また、屋外から室内に侵入する太陽光が室内HONO濃度に大きな影響を与え、屋外に近い室内HONO濃度になっていた。

As an important indoor pollutant, nitrous acid (HONO) can contribute to the concentration of indoor OH radicals by photolysis via sunlight penetrating into indoor environments, thus affecting the indoor oxidizing capability. In order to investigate the concentration of indoor HONO and its impact factors, three different indoor environments and two different locations in urban and suburban areas were selected to monitor indoor and outdoor pollutants simultaneously, including HONO, NO, NO, nitrogen oxides (NO), O, and particle mass concentration. In general, the concentration of indoor HONO was higher than that outdoors. In the urban area, indoor HONO with high average concentration (7.10 ppbV) was well-correlated with the temperature. In the suburban area, the concentration of indoor HONO was only about 1-2 ppbV, and had a good correlation with indoor relative humidity. It was mainly attributed to the heterogeneous reaction of NO on indoor surfaces. The sunlight penetrating into indoor environments from outside had a great influence on the concentration of indoor HONO, leading to a concentration of indoor HONO close to that outdoors.

Copyright © 2020. Published by Elsevier B.V.