Different cardiorespiratory effects of indoor air pollution intervention with ionization air purifier: Findings from a randomized, double-blind crossover study among school children in Beijing

Wei Dong, Shan Liu, Mengtian Chu, Bin Zhao, Di Yang, Chen Chen, Mark R. Miller, Miranda Loh, Junhui Xu, Rui Chi, Xuan Yang, Xinbiao Guo, Furong Deng

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Indoor air pollution is associated with numerous adverse health outcomes. Air purifiers are widely used to reduce indoor air pollutants. Ionization air purifiers are becoming increasingly popular for their low power consumption and noise, yet its health effects remain unclear. This randomized, double-blind crossover study is conducted to explore the cardiorespiratory effects of ionization air purification among 44 children in Beijing. Real or sham purification was performed in classrooms for 5 weekdays. Size-fractionated particulate matter (PM), black carbon (BC), ozone (O3), and negative air ions (NAI) were monitored, and cardiorespiratory functions were measured. Mixed-effect models were used to establish associations between exposures and health parameters. Real purification significantly decreased PM and BC, e.g. PM0.5, PM2.5, PM10 and BC were decreased by 48%, 44%, 34% and 50%, respectively. O3 levels were unchanged, while NAI was increased from 12 cm-3 to 12,997 cm-3. Real purification was associated with a 4.4% increase in forced exhaled volume in 1 s (FEV1) and a 14.7% decrease in fractional exhaled nitrogen oxide (FeNO). However, heart rate variability (HRV) was altered negatively. Interaction effects of NAI and PM were observed only on HRV, and alterations in HRV were greater with high NAI. Ionization air purifier could bring substantial respiratory benefits, however, the potential negative effects on HRV need further investigation. This study suggested that ionization air purification could bring substantial respiratory benefits while potential negative effects on cardiac autonomic function.

Original languageEnglish (US)
Article number113054
JournalEnvironmental Pollution
Volume254
DOIs
StatePublished - Nov 2019

Keywords

  • Cardiac autonomic function
  • Children
  • Ionization air purifier
  • Lung function
  • Size-fractionated PM

ASJC Scopus subject areas

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis

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