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Updated: Jun 26, 2026
Air-sampled Filter Analysis for Endotoxins and DNA Content
Published on: March 7, 2016
Indoor airborne endotoxin assessment in homes of Paris newborn babies
C Dassonville1, C Demattei, B Vacquier
1Laboratoire Santé Publique et Environnement, Université Paris-Descartes, Paris, France.
Insights
Airborne endotoxin levels in Paris homes were measured twice over a year. Higher levels were linked to cold weather, cockroaches, crowding, frequent floor cleaning, and infrequent vacuuming.
Area of Science:
- Environmental Health
- Indoor Air Quality
- Toxicology
Background:
- Endotoxins, components of Gram-negative bacteria, are indoor air pollutants linked to respiratory issues.
- Assessing endotoxin levels in urban environments is crucial for understanding potential health risks.
Purpose of the Study:
- To quantify airborne endotoxin levels in Parisian dwellings of newborns.
- To identify housing and living condition factors predicting endotoxin concentrations.
Main Methods:
- Air samples collected from 162 homes twice over one year.
- Endotoxin quantification using the chromogenic kinetic Limulus Amoebocyte Lysate test.
- Questionnaire data gathered on housing factors and living conditions.
Main Results:
- Geometric mean endotoxin levels were 0.509 EU/m³ and 0.557 EU/m³ across visits.
- Significant predictors of increased endotoxin included cold season, cockroach presence, higher occupant density, frequent floor cloth use, and infrequent vacuuming.
- The predictive model for endotoxin levels showed limited accuracy.
Conclusions:
- This study provides novel, repeated measurements of airborne endotoxin in Paris.
- Specific housing and cleaning practices influence indoor endotoxin levels.
- Improved sampling strategies are needed for accurate long-term exposure assessment in cohort studies.
Abstract:
The aims of this study were first to assess airborne endotoxin levels in the dwellings of 162 newborns living in Paris twice during a 1-year period, and second, to identify predictors for endotoxin concentrations using questionnaire data in relation to housing factors and living conditions. Air samples were collected on a glass fiber filter in polystyrene filter holders, using a pump at a flow rate of 3.5 l/min for 24 h placed in the main room of the home. Endotoxin levels were measured using a chromogenic kinetic Limulus Amoebocyte Lysate test. Geometric means (geometric standard deviation) of airborne endotoxin levels at two different visits were respectively 0.509 (4.289) EU/m3 and 0.557 (3.029) EU/m3. Airborne endotoxin levels were significantly increased: (i) in cold season (P = 0.024), with (ii) the presence of visible cockroaches in the previous 12 months at home (P < 0.001), (iii) increased number of inhabitants per square meter (P = 0.012), (iv) the high frequency of cleaning with the floor cloths (P = 0.0014), and (v) the low frequency of vacuuming (P = 0.0045). This study provided for the first time airborne endotoxin levels issued from repeated measurements in Paris dwellings. PRACTICAL IMPLICATIONS This analysis contributed to identify a few factors that determined indoor airborne endotoxin levels. However, the predictive model including housing factors and living conditions poorly estimated endotoxin levels. Consequently, multiple samples and longer sampling periods might improve the estimate of long-term airborne endotoxin exposure especially its variability, in cohort studies.
