Department of Data Science, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul, 05006, Republic of Korea.
School of Earth and Environmental Sciences, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea.
Sci Rep. 2023 Mar 14;13(1):4260. doi: 10.1038/s41598-023-31316-1.
The deterioration of air quality that threatens human health is recognized as focal compound hazard. Here, decisive thermodynamic conditions for activation of secondary aerosol formation have been investigated focused on Korea. In a dry environment with relative humidity < 60%, gas phase reaction to form fine particles depended largely on surface temperature. In a wet environment (relative humidity ≥ 60%), however, aqueous phase reaction of secondary inorganic aerosols, which are sulfate, nitrate, and ammonium, accounting for 67% of the total aerosol mass, was more activated. Thus, humidity is as important as temperature in the secondary production of aerosol; air quality often worsened when a low-pressure system was predominant over the Korean Peninsula. It is rather different from the general synoptic conditions of high concentrations of particulate matters characterized by high pressure and atmospheric stagnation. This study suggests additional favorable condition and responsible mechanism of air quality hazards that may be frequent in future.
威胁人类健康的空气质量恶化被认为是复合焦点危害。在这里，针对韩国，我们研究了决定二次气溶胶形成的决定性热力学条件。在相对湿度<60%的干燥环境中，气相反应形成细颗粒在很大程度上取决于表面温度。然而，在相对湿度≥60%的潮湿环境中，二次无机气溶胶（占总气溶胶质量的 67%）的水相反应更为活跃。因此，湿度在气溶胶的二次生成中与温度同样重要；当低气压系统在朝鲜半岛占主导地位时，空气质量往往会恶化。这与以高压和大气停滞为特征的高浓度颗粒物的一般天气条件相当不同。本研究提出了未来可能更频繁出现的空气质量危害的附加有利条件和责任机制。
