Paper on indoor air pollution intervention with ionization air purifier

06.11.2019

IOM Scientist Dr Miranda Loh has co-authored a paper entitled "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", newly published in Environmental Pollution.

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.

  • IOMworld Posted: 2 days ago
    Staff at Basildon Hospital have been exposed to up to 29x the legal limit of nitrous oxide. We are encouraging hosp… https://t.co/MecOyP4hgc
  • IOMworld Posted: 3 days ago
    We are delighted that IOM’s Rebecca Canham will be hosting ‘5 changes to your work that science shows will improve… https://t.co/9QbEbif1lh
  • IOMworld Posted: 4 days ago
    We are delighted that IOM’s Nathan Baker will be hosting a seminar on 'Working into the future, why people matter m… https://t.co/OHcB3ShpyP
  • IOMworld Posted: 8 days ago
    IOM are excited to be hosting a collaborative focus group as part of 'Exposome Project for Health & Occupational Re… https://t.co/czvDll28zC
  • IOMworld Posted: one month ago
    From everyone at IOM, we want to wish you the best this festive season. Thank you to all of our clients, collaborat… https://t.co/msu9bzPqxy
  • IOMworld Posted: one month ago
    RT @claire_horwell: Nice work by my colleagues at the Institute of Occupational Medicine (@IOMworld) on the respirable crystalline #silica
  • IOMworld Posted: 2 months ago
    Read the independent report on #COVID and Occupational Impacts from the UK Injuries Advisory Council. IOM's John Ch… https://t.co/ibKrBhgyul
  • IOMworld Posted: 2 months ago
    RT @therealfclabs: A week today! Free webinar - panel discussion and audience questions. Be part of the conversation. https://t.co/X59e9
  • IOMworld Posted: 2 months ago
    Improving understanding of gloves & dermal exposure to chemicals for professionals everywhere, IOM’s Karen Galea &… https://t.co/Tt4NUoa6y3
  • IOMworld Posted: 2 months ago
    RT @EU_OSHA: Systematic, holistic approach to #riskAssessment, covering both physical and psychosocial risks. This should actively involve…