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 an average of more than 80% of their time in enclosed spaces. For infants and young children, this proportion is even higher. Yet the air we breathe inside a home can contain pollutant concentrations that are sometimes higher than those measured outdoors.
This finding, documented for several years, takes on particular significance when it concerns children under 3. Their developing bodies, higher respiratory rates, and behaviors - time spent on the floor and frequently putting objects in their mouths - expose them more to contaminants present in their immediate environment.
What pollutants are found in homes?
Sources of indoor pollution are numerous and often unknown to parents. ANSES distinguishes 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 human carcinogen by the International Agency for Research on Cancer (IARC). Significant concentrations can be detected in children's bedrooms that have recently been renovated or furnished.
Fine and ultrafine particles
Cooking food, using candles or incense, and heating with wood-burning 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 specific biological vulnerability in 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. For the same body volume, 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 can have lasting effects on neurodevelopment. This point is documented in research on endocrine disruptors, which we covered in a dedicated article on ANSES recommendations.
What health authorities recommend
In light of these findings, several official organizations have issued recommendations for families. In its guides 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, refreshes 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 less-emitting 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's arrival, and allowing new furniture to off-gas in a ventilated room before installing it.
Limit indoor combustion sources
Scented candles, incense, and wood heating 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 offered. This approach aligns with health recommendations: reducing the chemical burden of a baby's everyday 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 where a child spends 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 substances of concern, and surfaces suitable for repeated contact with an infant's skin and mouth.
Toward better information for families
One of the main 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 develop educational resources for the general public.
The national program monitoring sudden infant death syndrome and communication campaigns on indoor air quality reflect a gradual increase in institutional awareness. Families wishing to explore the topic further can find regularly updated practical information 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 topic we explored in detail in our article on the infant microbiome in 2026.
What this means in practice for parents
The good news is that the most effective measures are often also the simplest and least expensive: ventilate, avoid chemical household products in rooms used by the baby, postpone renovations, and choose certified materials. These steps 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 composition, and questioning certifications are all habits that reflect an attentive approach to parenting, without unnecessary anxiety.
