Spatial and temporal relationship between China’s nighttime light index and PM2.5

doi:10.14088/j.cnki.issn0439-8114.2020.13.014

Abstract

Abstract: Nighttime light index was taken as a measurable spatial index to represent the level of urbanization, and its impact on PM2.5 pollution was explored, meanwhile the spatial and temporal relationship between them was analyzed. The results showed that China’s nighttime light index increased from 7.49% in 2000 to 11.05% in 2010 and 16.21% in 2015, showing a rapid growth trend. Accordingly, the concentration of PM2.5 increased from 32.10 μg/m³ in 2000 to 37.54 μg/m³ in 2010 and 37.44 μg/m³ in 2015. The growth trend of the two was highly consistent. Based on 405 typical urban areas, the nighttime light index increased from 22.48% in 2000 to 48.11% in 2010 and 62.78% in 2015, with growth rate of 179.27%, 1.54 times of the national average. The PM2.5 concentration in 405 typical cities increased from 28.99 μg/m³ to 53.51 μg/m³ in 2010 and 58.53 μg/m³ in 2015, with growth rate of 101.90%, 6.12 times of the national average. The increase of nighttime light index and PM2.5 pollution in typical urban areas was significantly higher than that in non-urban areas, with a significant positive correlation （R²=0.582 8）. Research shows that China’s urbanization process, especially economic development, has a huge impact on urban air pollution, directly exacerbating PM2.5 pollution.

Key words: urban expansion, nighttime light index, PM2.5 pollution, spatial and temporal relationship

CLC Number:

X513

WANG Gui-lin, GAO Fang, LU Gai, WANG Shi-yan, LI Ri-sheng. Spatial and temporal relationship between China’s nighttime light index and PM2.5[J]. HUBEI AGRICULTURAL SCIENCES, 2020, 59(13): 54-60.

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