An observational study in Asthma in Children and Allergy, sponsored by University Hospital, Montpellier. Active, not recruiting at 1 site in France. Per ClinicalTrials.gov, last updated 2025-12-15.
Sponsored by University Hospital, Montpellier · Observational
The number and types of indoor air pollutants in schools is rising, however little is known about the impact of their potentially synergistic interactions, upon schoolchildren health. Among children, highly susceptible individuals to air pollution include allergy and asthma sufferers, and a low socioeconomic background, however no specific guidance is available.
The Syn-Air-G project will develop a comprehensive and responsive multipollutant monitoring system (in accessible and actionable formats) by constructing and deploying novel but validated and improved sensors of chemical and biological (allergens, microbes) pollutants) and advancing environmentally friendly interventions (including air purifiers). Health: A comprehensive multidisciplinary and exposome approach of health effects of multi-pollution in small children.
Exposure to indoor air pollutants is evidently a critical issue for human health. For the paediatric population, good indoor air quality in the school's environment is an important contributor to the overall and respiratory health, attendance, and academic performance , while poor air quality is associated to a high risk for adverse health outcomes, especially in the vulnerable asthmatic population . Viruses, microbes, allergens, and chemical pollutants exhibit a complex interaction with the human immune system, depending upon several factors such as the age, predisposition (e.g., atopy) and identity of the agent . Pollen exposure increases the risk of viral infections, such as those attributed to rhinoviruses (RVs) and SARS-Cov2 , while viruses and allergens have been shown to interact with pollutants such as ozone (O3) and fine particles (PM2.5), increasing their morbidity effects. Viral infections, especially RVs, impair anti-bacterial innate immune responses , thus affecting the overall microbiome homeostasis.
There are suggestions of potential synergies between different environmental factors, including gas and particulate chemical pollutants, allergens, and viral/microbial species, particularly in the sensitive younger ages, however, such synergies have not been addressed in a real-life epidemiological, systematic, longitudinal study.
The list of indoor air pollutants associated with significant burden on health disorders and increasing social and economic costs, is long and expanding, as current knowledge evolves, on this particular subject. The detrimental effects of air pollution on several health aspects have recently been reviewed. Additionally, a joint statement by the American Thoracic Society (ATS) and the European Respiratory Society (ERS) integrated the latest scientific evidence showing that air pollution affects almost all systems of the human body, including the respiratory, cardiovascular, central nervous, and endocrine systems Studies based on google trend models have shown significant impact of pollutants on respiratory symptoms, especially during increased pollen season in sensitized individuals . Children, one of the most susceptible subgroups in the population, spend a large proportion of their time indoors such as in the school environments, thus, raising the interest in characterizing the health relevant air pollutants in this microenvironment. Studies of air quality composition in classrooms, has shown that several pollutants' levels exceed the recommended air quality standards . The detrimental health effects of exposure to school-derived pollution have been shown for certain pollutants , while a disproportionate effect has been documented in asthmatics, more so in those born prematurely. Schools also act as accumulators of airborne threats, such as viruses or allergens, which are of particular importance to a large but quite vulnerable proportion of the paediatric population: those will allergies and asthma . Allergens are well known elicitors of respiratory symptoms in sensitized individuals, although the allergen effect is person-specific and non-linear , while associations between aeroallergen exposure in schools and increased asthma morbidity has been documented . Although there is evidence suggesting potential synergies between several different factors, health effects of pollutants are more frequently assessed individually, while results on studies assessing multiple pollutants provide divergent results . The cumulative and/or synergistic exposure between chemical and biological (allergens, microbes) pollutants and how these may affect respiratory symptoms, immune, and mental health and DNA damage is barely known. Moreover, school-based environmental interventions on health outcomes studies, are small and not adequately powered.
The SynAir-Child study, within the context of the EU SynAir-G project, is an epidemiological real-life observational study, aiming to assess if there's a possible association and synergy between indoor air pollutant variability and general, respiratory, immune, and mental health outcomes in school children, based on different socioeconomic backgrounds and on different settings, in different Countries.
Previous studies, such as the European SINPHONIE study, the CAMP study on the association Between Allergen Exposure in Inner-City Schools and Asthma Morbidity Among Students, assessed in real-life settings the composition of school air quality and the impact of certain environmental elements on different health outcomes. Although the indication and aim of the studies is similar, the design of the SynAir-Child study provides a unique setting to prospectively assess the synergistic effects of pollutants at school and outdoor on several health aspects in a large and diverse cohort. In addition, outcomes that constitute an adverse health effect of air pollution on humans' health, as stated in the joint ERS/ATS policy statement, will be evaluated and included in the study. Most importantly, the continuous nature of information provided by sentinel devices set in the schools, will provide an individualized baseline of specific indicators that will be monitored during the follow-up period, to identify personalized health alterations, instead of comparing to generalized standards. It is estimated that the use of a personalized physiological profile can more accurately detect subtle changes in an individual's health markers, leading to a greater likelihood of early detection, in relation to the cumulative environmental exposures. Health outcome data, including respiratory health, immune fitness and both mental and non-mental perspectives will contribute to pollution sensing in an iterative way.
1,916 studies on the registry are indexed under Hypersensitivity; 265 are open to participants now.
This study's planned enrollment of 500 is above the median of 115 across 479 observational studies indexed under Hypersensitivity.
Browse Hypersensitivity studies →University Hospital, Montpellier is the lead sponsor of 1,244 studies on the registry; 225 are open to participants now.
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A maximum of 500 schoolchildren at CM1 level (French education system), equally distributed between males and females, will derive from a maximum of eight primary schools and 2-3 classes of CM1 in each school, when available. Therefore, two-three classrooms per schools, in no more than 8 schools, each year, over 2 consecutive school years will be monitored, and children will be followed-up during 10 months.
The selection of schools will be based on socioeconomic and air pollution criteria (differences between different regions of the participating centres) and whenever possible on annual reports on air quality (if available) from the respectively Directorate of Climate Change and Atmospheric Quality of the Ministry of Environment.
Exclusion Criteria:
Child or child's parents/guardian's who:
Performing lung function tests and FeNO following European Respiratory Society (ERS) standardized guidelines, through the MIR portable spirometer and the NIOX Vero®, respectively. Spirometry is performed using a portable spirometer. All manoeuvres are performed according to the American Thoracic Society and European Respiratory Society (ATS/ERS) standards. FeNO test is a quick and non-invasive test that is easy for children to do. To take the test, the child have to blow into a handheld device (NIOX Vero®). More in detail, children are asked to inhale ambient air through a nitrogen oxide scrubber to total lung capacity, and then exhale for 10 seconds. The test results are available right away.
(Baseline, Follow-up, Quality of life and Final) allowing to collect data on sociodemographic characteristics, health outcomes, potential risk factors, lifestyle and living environment. Health outcomes will consider general health (general status, infections, allergies), respiratory health (asthma symptoms, diagnosis, control, triggers, medications, etc.), perception of health and well-being.
Children will have to answer a daily questionnaire on cell phone, tablet, computer...), with the help of parents/caregivers. To encourage children to answer the questions, the questionnaires will be incorporated into a game that will also teach them about environmental challenges and pollutants in Europe. There will be a general health questionnaire with 3 questions assessed on a Likert scale. The application will also include 2 questions on respiratory health, with Yes/No answers. If the answer is Yes to one of the questions, the intensity of symptoms will be assessed on a visual analog scale from 0 to 100 (0 almost no symptoms and 100 the most intense symptoms imaginable).
On a voluntary basis, a urine sample will be collected, as well.
* Particulate matter (PM) will be assessed with a counter as a well as a remote sensor (Canarin) . * Volatile Organic Compound (VOCs) with a passive sampler (Radiello). * Virus and bacteria will be collected with a pump. The devices will be attached to the classroom wall. In addition, dust pollution will be assessed by collecting dust with a vacuum cleaner in order to assess phthalates (Dimethyl phthalate, diethyl phthalates, Di(2-ethylhexyl) phthalate).
Indoor classroom air concentrations of Pollutants and dust
Classrooms concentrations (mean with standard deviation SD) of Viruses, Microbe, Allergens, Chemical Air Pollutants (particulate mater PM , NO2, VOCs, phthalates) (ppm part per million) in air and dust.
Time frame: For 10 Months
Prevalence for respiratory disease
Health outcomes measures by the prevalence (%) for allergic and respiratory health reported physician-based diagnosis of asthma and/or allergies. Questionnaires about respiratory health disease based on validated International Study of Asthma and Allergies in Childhood (ISAAC) and PreDicta respiratory * Asthma Control Test (ACT) composed of 7 items with a Score 20 to 25 means a well-controlled asthma, Score 15 - 19: partially controlled asthma and a Score \< 15 means an uncontrolled asthma * Asthma control questionnaire (ACQ) composed of 7 items and Scores range between 0 (totally controlled asthma) and 6 (severely uncontrolled).) * Visual Analogic Scale (VAS) Questionnaire on the App (a score of 0 no symptoms and 100 the most respiratory symptoms)
Time frame: For 10 Months
Association between asthma and indoor air contaminants
Significant association of indoor air quality contaminants and their interactions with health outcomes in schoolchildren: odds-ratio and 95% confidence interval between active asthma and indoor air total Volatile Organic Compound (VOCs) and dust phthalates.
Time frame: For 10 Months
prevalence of children presenting airways obstruction
In children, the severity of airway obstruction can be graded according to Forced expiratory volume in one second (FEV1) measured by spirometry, percentage predicted measured by spirometry: FEV1 \<100% to 80% indicates mild obstruction in children; FEV1 \<80% to 50% indicates moderate obstruction; FEV1 \<50% to 30% indicates severe airway obstruction; and FEV1 \<30% indicates very severe obstruction.
Time frame: Between baseline and 10 Months
Prevalence of children with an abnormal FeNO
Percentages of children with an abnormal FeNO. In clinical practice, a normal FeNO test in children is any number less than 20 parts per billion (ppb) in patients without lung inflammation. The FeNO will be measured with a handheld device (NIOX Vero®).
Time frame: Between baseline and 10 Months
Quality of life and wellbeing
General health outcomes will be measured with the use of a subset of questions from the Child Health Questionnaire (CHD) with 13 items, height (centimeter) and weight (kilogram) Quality of life will be measured with the validated Pediatric Quality of Life (PedsQL) questionnaire composed of 23 items and score on a reverse scale of 100 points. ("Never") = 100 = better quality of life, ("Almost Never") = 75("Sometimes") = 50("Often") = 25 ("Almost Always") = 0 = worst quality of life.
Time frame: At 10 months
diagnosis of any disease and respiratory diseases
General health confirmed by questionnaire and physicians based diagnosis VAS Questionnaire on the app Through Quality of life and wellbeing questionnaires based on validated International Study of Asthma and Allergies in Childhood (ISAAC), PreDicta respiratory, ACT, ACQ
Time frame: At 10 months
Environmental source of pollutants
Children and their caregivers will answer standardized questionnaires on sources and exposures of pollutant. (qualitative questionnaire, no scoring)
Time frame: Baseline
Plan to share: Undecided
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This study is active, not recruiting, as verified in Jul 2025. You cannot join it, but the record below documents what was studied.
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University Hospital, Montpellier