Scholarlink

<p>Traffic noise is a pervasive environmental stressor in high-density cities, yet field evidence on the buffering capacity of small urban green spaces remains limited. This study examines whether roadside pocket parks can provide measurable regulation of traffic noise and fine particulate matter (PM<sub>2.5</sub>), and how this function varies with park size. We collected 544 paired, synchronous measurements of noise (<i>L</i><sub>Aeq</sub>) and PM<sub>2.5</sub> along 5–50&#xa0;m transects in 12 pocket parks in Shenyang, China, during peak traffic periods, and applied mixed-effects models, Bayesian hierarchical analysis, quantile regression, and ROC-based threshold optimisation. Noise attenuation was robust under warm-season leaf-on conditions, with a core slope of − 1.21 dB per 10&#xa0;m (95% CI: −1.61 to − 0.83) and a broadly near-linear pattern. Park area significantly strengthened this effect, improving attenuation by − 0.21 dB per 10&#xa0;m for each additional 1,000&#xa0;m², whilst Bayesian analysis indicated that two small parks had a high posterior probability of providing no meaningful noise reduction. ROC analysis identified an empirical distance threshold of approximately 30–40&#xa0;m for short-term compliance with 55 dB(A), although overall compliance remained low. By contrast, PM<sub>2.5</sub> showed only a weak, baseline-sensitive distance effect. These findings indicate that roadside pocket parks function as selective urban ecosystem buffers and provide empirical evidence for the ecological planning and design of small urban green spaces in compact cities.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Spatial attenuation of noise and PM2.5 in roadside pocket parks

  • 期刊论文

  • 发表日期：

    2026年7月21日

查看全文
  • Wanqi Gao,
  • Xinhao Yang,
  • Yao Fu,
  • Xiaodong Lu,
  • Yuan Zhang

摘要

Traffic noise is a pervasive environmental stressor in high-density cities, yet field evidence on the buffering capacity of small urban green spaces remains limited. This study examines whether roadside pocket parks can provide measurable regulation of traffic noise and fine particulate matter (PM2.5), and how this function varies with park size. We collected 544 paired, synchronous measurements of noise (LAeq) and PM2.5 along 5–50 m transects in 12 pocket parks in Shenyang, China, during peak traffic periods, and applied mixed-effects models, Bayesian hierarchical analysis, quantile regression, and ROC-based threshold optimisation. Noise attenuation was robust under warm-season leaf-on conditions, with a core slope of − 1.21 dB per 10 m (95% CI: −1.61 to − 0.83) and a broadly near-linear pattern. Park area significantly strengthened this effect, improving attenuation by − 0.21 dB per 10 m for each additional 1,000 m², whilst Bayesian analysis indicated that two small parks had a high posterior probability of providing no meaningful noise reduction. ROC analysis identified an empirical distance threshold of approximately 30–40 m for short-term compliance with 55 dB(A), although overall compliance remained low. By contrast, PM2.5 showed only a weak, baseline-sensitive distance effect. These findings indicate that roadside pocket parks function as selective urban ecosystem buffers and provide empirical evidence for the ecological planning and design of small urban green spaces in compact cities.