Scholarlink

<p>As one of the most ammonia-contaminated areas, China remains largely underexplored in understanding urban–rural differences and the mitigation potential. Here, we used infrared atmospheric sounding interferometer (IASI) observations to derive the spatiotemporal patterns of NH<sub>3</sub> columns in China. Utilizing urban–rural buffers and multiscale geographically weighted regression (MGWR), our analysis in Chinese cities encompassed both urban–rural differences in the mean and interquartile range (IQR) of atmospheric NH<sub>3</sub> columns and the effects of relevant factors on NH<sub>3</sub>. Our findings revealed that China's NH<sub>3</sub> columns continued to increase between 2008 and 2021. Urban NH<sub>3</sub> columns were higher in both polluted and clean cities compared to rural areas, with cold and hot spots observed in certain cities. The IQR pattern showed that mitigation potential was relatively high for polluted cities at both urban and rural scales, while the mitigation probability for clean cities fluctuatingly increased along the urban–rural gradient. Moreover, the regression results showed that precipitation effectively mitigated NH<sub>3</sub> columns&#xa0;and enhanced&#xa0;the mitigation potential in most Chinese cities. NO<sub>2</sub> and SO<sub>2</sub> can deplete NH<sub>3</sub> in specific areas, with SO<sub>2</sub> being more influential. GDP and human footprint primarily reflect how regional policies and human activities affect the NH<sub>3</sub> columns. However, rising temperatures and acid gas levels will increase both NH<sub>3</sub> column and IQR concentrations, which may have a double-edged impact on the management of NH<sub>3</sub> pollution. In conclusion, pollution strategies that integrate optimal mitigation distances and factors will be more effective in mitigating NH<sub>3</sub> pollution.</p> Graphical abstract <p></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

Spatiotemporal dynamics and mitigation potential of atmospheric NH3 in China: insights from urban–rural gradients and multiscale geographically weighted regression

  • 期刊论文

  • 发表日期：

    2026年2月11日

查看全文
  • Pengfan Wen,
  • Chunkang Zhang,
  • Xinpeng Wang,
  • Xiaodong Deng,
  • Xianyun Zhang

摘要

As one of the most ammonia-contaminated areas, China remains largely underexplored in understanding urban–rural differences and the mitigation potential. Here, we used infrared atmospheric sounding interferometer (IASI) observations to derive the spatiotemporal patterns of NH3 columns in China. Utilizing urban–rural buffers and multiscale geographically weighted regression (MGWR), our analysis in Chinese cities encompassed both urban–rural differences in the mean and interquartile range (IQR) of atmospheric NH3 columns and the effects of relevant factors on NH3. Our findings revealed that China's NH3 columns continued to increase between 2008 and 2021. Urban NH3 columns were higher in both polluted and clean cities compared to rural areas, with cold and hot spots observed in certain cities. The IQR pattern showed that mitigation potential was relatively high for polluted cities at both urban and rural scales, while the mitigation probability for clean cities fluctuatingly increased along the urban–rural gradient. Moreover, the regression results showed that precipitation effectively mitigated NH3 columns and enhanced the mitigation potential in most Chinese cities. NO2 and SO2 can deplete NH3 in specific areas, with SO2 being more influential. GDP and human footprint primarily reflect how regional policies and human activities affect the NH3 columns. However, rising temperatures and acid gas levels will increase both NH3 column and IQR concentrations, which may have a double-edged impact on the management of NH3 pollution. In conclusion, pollution strategies that integrate optimal mitigation distances and factors will be more effective in mitigating NH3 pollution.

Graphical abstract