Case Study

Indoor air quality in a community.



5 Weeks – 3 Schools – 2 Analyzers

Analyse BTEX - Analyse Formaldéhyde

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Observe the contributions of building, furniture and activities on concentrations of pollutants.

Test different ventilation scenarios. Study the influence of aeration on pollutant concentrations and CO2 (use of a containment light indicator ventilation guidelines).


Etude de cas - Analyse formaldéhyde - Ville de La Rochelle

Improving air quality in schools and nurseries is a priority for the community of La Rochelle. In a dynamic of health promotion this community participated in the project IMPACT’AIR. With the support of ADEME and the League Against Cancer the project took place in several stages:

– Monitoring and field data collection
– Interpretation and exploitation of results
– Dynamic Measurement (In’Air Solutions)
– Conclusion and research of action to improve indoor air quality

In’Air Solutions intervened in the third stage of the process. The indoor air quality of schools in the La Rochelle community had to be measured dynamically.

The intervention of In’Air Solutions made it possible to carry out formaldehyde analyzes in two classrooms for five weeks. This innovative technique of pollutant measurements makes it possible to know precisely the evolution of concentrations during the day, when the passive tubes (the regulatory method used in an upstream stage) give only averages over the week



 The usual aeration is insufficient for satisfactory sanitary air exchange.Mounting and furnishing are the main contributors of formaldehyde in the air (same conclusions from INCITAIR).
The relative humidity and air permeability of the building are important factors in the dynamics of formaldehyde emissions.
The opening of the windows contributes to the marked reduction of formaldehyde and CO2 with a rapid but short-lived effect. Regular ventilation in the presence of children should therefore be preferred.
The ventilation protocol proposed to the classes (OQAI guide *: half an hour of ventilation before class, in the presence of children, at recess and after class) was perceived as too restrictive and sometimes inappropriate to real situations Life of the class
The use of a light indicator helps to aerate the classrooms
There is insufficient information and awareness of IAQ issues. Awareness-raising must be undertaken. It must be accompanied by a commitment from the City to improve the reception environment within its built heritage.