A Home Environment Under Scientific Scrutiny
Indoor air quality is now recognized as a major public health issue. According to the French Agency for Food, Environmental and Occupational Health & Safety (ANSES), people in France spend more than 80% of their time in enclosed spaces on average. For infants and young children, this proportion is even higher. Yet the air inside a home can contain pollutant concentrations that are sometimes higher than those measured outdoors.
This finding, documented for several years, is particularly significant when it concerns children under 3. Their developing bodies, higher respiratory rates, and behaviors—time spent on the floor and frequent mouthing of objects—make them more vulnerable to contaminants in their immediate environment.
Which Pollutants Are Found in Homes?
Sources of indoor pollution are numerous and often unknown to parents. ANSES identifies several major categories of pollutants that may be present in the living spaces of young children.
Volatile Organic Compounds (VOCs)
Volatile organic compounds are emitted by many common materials: paints, varnishes, adhesives, engineered wood furniture, and flexible floor coverings. Among them, formaldehyde is classified as a known carcinogen to humans by the International Agency for Research on Cancer (IARC). Significant concentrations may be detected in children’s bedrooms that have recently been renovated or furnished.
Fine and Ultrafine Particles
Cooking food, using candles or incense, and burning wood in heating appliances generate fine particles whose effects on the respiratory system are well documented. In infants, whose airways are still maturing, repeated exposure to these particles is associated in the scientific literature with an increased risk of respiratory infections and asthma.
Biological Allergens
Dust mites, mold, and pet dander: these biological allergens thrive in poorly ventilated or damp environments. Excessive humidity in a home is identified by the World Health Organization (WHO) as a risk factor for children’s respiratory health, particularly in connection with the development of allergies and asthma.
A Biological Vulnerability Specific to Young Children
Understanding why babies are more exposed than adults requires considering several physiological factors. First, their respiratory rate is significantly higher: an infant breathes between 30 and 40 times per minute, compared with 12 to 20 times for an adult. Relative to their body size, they therefore inhale proportionally much more air—and more pollutants—than their parents.
In addition, the liver and kidneys’ detoxification systems are not yet fully functional in young children, which limits the body’s ability to eliminate certain substances. Finally, the brain and central nervous system undergo intense development during the first years of life, a period when certain chemical exposures may have lasting effects on neurodevelopment. This is documented in research on endocrine disruptors, which we covered in an article dedicated to ANSES recommendations.
What Health Authorities Recommend
In light of these findings, several official organizations have issued recommendations for families. In its guidance on indoor air quality, ANSES emphasizes a few fundamental principles accessible to all families.
Ventilate Living Spaces Regularly
Opening the windows for at least ten minutes a day, even in winter, renews indoor air and dilutes pollutant concentrations. This recommendation applies particularly to the baby’s room, where the child spends a large part of their time.
Choose Lower-Emission Products and Materials
When furnishing an infant’s room, ANSES recommends choosing materials bearing VOC emission labels (A+ classification in France), avoiding painting or renovation work in the weeks before the child arrives, and allowing new furniture to off-gas in a ventilated room before installing it.
Limit Indoor Combustion Sources
Scented candles, incense, and wood-burning heaters in older appliances are all sources of fine particles and chemical compounds whose use is discouraged in spaces frequented by young children. Santé publique France reminds us that tobacco smoke, even when residue remains on clothing or surfaces, represents a significant exposure for infants.
The Role of the Immediate Environment: What Parents Can Control
The philosophy of slow parenting, as documented in developmental psychology research, encourages greater attention to the quality of the environment in which a child grows up rather than to the quantity of stimulation or products provided. This approach aligns with health recommendations: reducing the chemical burden of a baby’s daily environment is a concrete preventive measure, even before it becomes a consumer choice. We explored this philosophy in greater detail in our article on slow parenting and its scientific foundations.
With this in mind, the choice of objects that come into direct contact with the baby deserves particular attention. Surfaces on which children spend time—play mats, cushions, and mattresses—can expose them to chemical substances if they do not meet strict standards. The Treelys play mat was designed with these requirements in mind: certified materials, no concerning chemical compounds, and surfaces suitable for repeated contact with an infant’s skin and mouth.
Toward Better Information for Families
One of the major obstacles to prevention remains the lack of accessible and reliable information for parents. Sources are numerous, messages are sometimes contradictory, and the mental load of parenting leaves little room for in-depth research. This is precisely why organizations such as ANSES and Santé publique France are developing educational resources for the general public.
The national monitoring program for sudden infant death syndrome and communication campaigns on indoor air quality reflect a gradual increase in institutional awareness. Families wishing to explore the subject further can find regularly updated practical fact sheets on indoor air quality in homes on the ANSES website.
Research on the infant microbiome also provides additional insight into the relationship between the home environment and early immune development, a subject we covered in detail in our article on the infant microbiome in 2026.
What This Means for Parents in Practical Terms
The good news is that the most effective measures are often also the simplest and least expensive: ventilate, avoid chemical household products in rooms where the baby spends time, postpone renovations, and choose certified materials. These actions do not require revolutionizing your lifestyle, but they do require clear and accessible information.
As a brand committed to sustainable and thoughtful childcare, Treelys believes that transparency about environmental issues is an integral part of supporting families. Choosing less but better, learning about product ingredients, and asking questions about certifications are all habits that reflect an attentive approach to parenting, without unnecessary anxiety.
