ArticleHeliyon2021
Assessing effectiveness of air purifiers (HEPA) for controlling indoor particulate pollution.
Article in Heliyon, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers, 1 of them a synthesis that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
19 citing papers in PubMed, 1 synthesis or guideline pooled it, 84 citations in OpenAlex.
- Air pollution and hospitalization risk in infants with bronchiolitis: A systematic review and meta-analysis.Pediatric allergy and immunology : official publication of the European Society of Pediatric Allergy and Immunology · 2025Pooled it
- The Effects of Indoor Pollutants on Health Care Workers, Patients, and Caregivers in Dental Clinics: A Systematic Review.European journal of dentistry · 2026Article
- Post-Wildfire Indoor Pollution in WUI Areas following the 2025 Los Angeles Fires. Part I. Establishing Baseline Contaminant Levels Prior to Home Reoccupation.ACS ES&T air · 2026Article
- Xenobiotic Toxicants and Particulate Matter: Effects, Mechanisms, Impacts on Human Health, and Mitigation Strategies.Journal of xenobiotics · 2025Review
- Hospital-borne hazardous air pollutants and air cleaning strategies amid the surge of SARS-CoV-2 new variants.Heliyon · 2024Review
- Modeling the Geometry and Filter Composite of the Air Cleaner.Materials (Basel, Switzerland) · 2024Article
- Adverse Associations of Long-Term Exposure to PMToxics · 2024Article
- Exploring toilet plume bioaerosol exposure dynamics in public toilets using a Design of Experiments approach.Scientific reports · 2024Article
- Personal Strategies to Reduce the Cardiovascular Impacts of Environmental Exposures.Circulation research · 2024Review
- An overview of SARS-CoV-2 transmission and engineering strategies to mitigate risk.Journal of building engineering · 2023Review
- Internet of things based visualisation of effect of air pollution on the lungs using HEPA filters air cleaner.Heliyon · 2023Review
- A theoretical study on the filtration efficiency and dust holding performance of pleated air filters.Heliyon · 2023Article
- Assessment of natural ventilation strategy to decrease the risk of COVID 19 infection at a rural elementary school.Heliyon · 2023Article
- Article
- Particulate matter and Alzheimer's disease: an intimate connection.Trends in molecular medicine · 2022Review
- Reducing the Effectiveness of Ward Particulate Matter, Bacteria and Influenza Virus by Combining Two Complementary Air Purifiers.International journal of environmental research and public health · 2022Article
- Indoor Air Quality in Tujia Dwellings in Hunan, China: Field Tests, Numerical Simulations, and Mitigation Strategies.International journal of environmental research and public health · 2022Article
- Portable air cleaner use and biomarkers of inflammation: A systematic review and meta-analysis.American heart journal plus : cardiology research and practice · 2022Article
- The energy and time saving coordinated control methods of CO2, VOCs, and PM2.5 in office buildings.PloS one · 2022Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The present study deals with an evaluation of the air purifier's effectiveness in reducing the concentration of different sized particulate matter (PM) and ions in the real-world indoor environment. Two types of air purifiers (API and APII) mainly equipped with High-Efficiency Particulate Air (HEPA) filters that differed in other specifications were employed in general indoor air and the presence of an external source (candles and incense). The gravimetric sampling of PM was carried out by SKC Cascade Impactor and further samples were analyzed for determining ions' concentration while real-time monitoring of different sized PM was done through Grimm Aerosol Spectrometer (1.109). The result showed that API reduced PM levels of different sizes ranged from 12-52% and 29-53% in general indoor air and presence of external source respectively. Concerning the APII, a higher decrease percent in PM level was explored in presence of an external source (52-68%) as compared to scenarios of general indoor air (37-64%). The concentrations of the ions were noticed to be decreased in all three size fractions but surprisingly some ions' (not specific) concentrations increased on the operation of both types of air purifiers. Overall, the study recommends the use of air purifiers with mechanical filters (HEPA) instead of those which release ions for air purification.
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What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.