Humidity plays an important role in the PM₂.₅ pollution in Beijing.

@article{Cheng2015HumidityPA,
  title={Humidity plays an important role in the PM₂.₅ pollution in Beijing.},
  author={Yuan Cheng and K. He and Zhen-yu Du and M. Zheng and F. Duan and Yong-liang Ma},
  journal={Environmental pollution},
  year={2015},
  volume={197},
  pages={
          68-75
        }
}
Heavily-polluted PM₂.₅ (fine particulate matter) episodes frequently impacting Beijing, especially during winter, have become a substantial concern. We found that during winter, the daily variation of PM2.5 in Beijing tracked the pattern of relative humidity (RH). With the increase of PM₂.₅ (or RH), water-soluble components (especially inorganic ions) became more abundant, and the water-soluble organic carbon to organic carbon ratios increased. The nitrate to sulfate ratios also exhibited… Expand
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