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Underestimated Formaldehyde Emissions from Residential Coal Combustion in Rural China.

Min Zhao1, Hengqing Shen1,2, Gen Zhang3

  • 1Environment Research Institute, Shandong University, Qingdao, Shandong 266237, China.

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Formaldehyde (HCHO) emissions from North China

Keywords:
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Area of Science:

  • Atmospheric Chemistry
  • Environmental Science
  • Air Pollution

Background:

  • Formaldehyde (HCHO) is a key precursor to atmospheric radicals.
  • Its emission sources, particularly from residential combustion, are not well understood.
  • Accurate quantification is crucial for atmospheric modeling and air quality assessment.

Purpose of the Study:

  • To quantify primary formaldehyde emissions from residential coal combustion and biomass burning.
  • To assess the impact of formaldehyde on winter atmospheric chemistry.
  • To evaluate current emission inventories for formaldehyde.

Main Methods:

  • Wintertime atmospheric observations at a rural site in North China.
  • Analysis of diurnal patterns and correlations with combustion tracers (CO, SO2).
  • Determination of emission ratios using the minimum R squared method.
  • Chemical box model simulations.

Main Results:

  • Observed bimodal diurnal formaldehyde patterns linked to coal combustion (morning) and biomass burning (afternoon).
  • Formaldehyde emission ratio from coal combustion exceeded inventory estimates by up to an order of magnitude.
  • Formaldehyde significantly influenced modeled concentrations of HO2, RO2, OH, ozone production, and particulate matter.

Conclusions:

  • Residential coal combustion is a major, underestimated source of formaldehyde emissions.
  • Formaldehyde plays a critical role in winter atmospheric chemistry.
  • Emission inventories require urgent revision for formaldehyde from residential coal combustion.