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Key figures on indoor air quality

JVD Shield air purifiers improve indoor air quality

Indoor air quality is a vast area of expertise, and numerous figures circulate on the internet about it. Whether you are a journalist, scientist, or simply curious to learn more about the air you breathe, JVD presents today a compilation of key figures related to indoor air quality (IAQ).
IAQ concentration figures

  • Indoor air is 10 times more polluted than outdoor air, according to OQAI.

  • There are more than 5,000 pollutants in indoor air, according to Isabella Annesi-Maesano, a professor of environmental epidemiology.

  • A European standard establishes the ideal humidity level in the air of a dwelling between 30 and 70%, but French doctors have agreed to tighten this guideline value to between 40 and 60%.
IAQ health figures

  • Allergic seizures are reduced by the beneficial effects of Shield and Shield Compact air purifiers

    One in three people is allergic in France in 2023, according to the WHO, and soon one in two by 2050.

  • More than three out of four children breathe air that negatively impacts their health in France, according to UNICEF.

  • There are 12 times fewer risks of coronavirus contamination in a classroom equipped with an air purifier, according to a project led by engineer Bert Blocken (KU Leuven/TU Eindhoven), virologist Marc Van Ranst (KU Leuven), and Leen Peeters (Th! Nk E).

  • Living within 50 meters of a road axis increases the risk of developing asthma by 180%, according to Dr. Laurent Nicod, head of the pulmonology department at the University Hospital of Vaud (Switzerland).

  • Nosocomial infections represent approximately 750,000 infections per year and would be the direct cause of 4,000 deaths in France, according to INSERM.

  • Each year in France, nearly 40,000 deaths are attributable to exposure of people aged 30 and over to fine particles (PM2.5), according to Santé Publique France.

  • In 2019, air pollution caused approximately 9 million premature deaths worldwide, according to The Lancet Planetary Health.
IAQ behavioral figures

  • 80% of our time is spent indoors, according to the Ministry of Ecological Transition.

  • On average, 15,000 liters of air are breathed per day per person, according to Recosanté.

  • According to the Canadian Lung Association, the average adult breathes more than 900 times per hour.
  • On average, 16% of hotel guests complain about unpleasant odors in these establishments, according to Coach Omnium.

    Key figures on indoor air quality
  • If possible, open windows in your premises for at least 5 to 10 minutes a day to achieve CO2 levels below 800ppm (recommended threshold value) for a frequented space (meeting room, open spaces). 

  • HEPA air purifiers can improve productivity by up to 11% in an indoor space thanks to their beneficial effects on air quality, according to the Ministry of Solidarity and Health.


  • Short-term sick leave decreases by 10% when indoor air pollutants are reduced by half in workspaces, according to a study by REHVA.


  • The cost of absenteeism due to poor indoor air quality is estimated at €450 per year per employee, according to the Harvard School of Public Health.

  • The cost of urban pollution is €1,200 per inhabitant per year in the Lyon and Grenoble agglomerations, according to INSERM and CNRS.


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