Abstract
The Near-Road Exposures and Effects of Urban Air Pollutants Study (NEXUS) investigated the impact of exposure to traffic-related air pollution on the respiratory health of asthmatic children in Detroit, Michigan. Since indoor mold exposure may also contribute to asthma, floor dust samples were collected in participants homes (n = 112) to assess mold contamination using the Environmental Relative Moldiness Index (ERMI). The repeatability of the ERMI over time, as well as ERMI differences between rooms and dust collection methods, was evaluated for insights into the application of the ERMI metric. ERMI values for the standard settled floor dust samples had a mean ± standard deviation of 14.5 ± 7.9, indicating high levels of mold contamination. ERMI values for samples collected from the same home 1 to 7 months apart (n = 52) were consistent and without systematic bias. ERMI values for separate bedroom and living room samples were highly correlated (r = 0.69, n = 66). Vacuum bag dust ERMI values were lower than for floor dust but correlated (r = 0.58, n = 28). These results support the use of the ERMI to evaluate residential mold exposure as a confounder in air pollution health effects studies.
Highlights
Asthma is the most common chronic disease of children in the United States (US) [1, 2]
The asthmatic children in Detroit that participated in NEXUS had homes with high levels of mold contamination compared to previous studies that used the standard Environmental Relative Moldiness Index (ERMI) settled floor dust samples
We examined whether the standard composite ERMI dust sample provided reasonably consistent estimates of mold contamination in a home over a period of months based on repeat samples from the same home
Summary
Asthma is the most common chronic disease of children in the United States (US) [1, 2]. Living close to busy roads may be an important risk factor for onset of childhood asthma, and studies have found positive associations between exposure to traffic-related pollution and wheezing in children [4]. Exposure of children in Detroit to ambient air pollutants has been associated with asthma exacerbation [5,6,7]. Air Pollutants Study (NEXUS) is investigating the impact of exposure to traffic-related air pollutants on the respiratory health of a cohort of children with asthma who live near major roadways in Detroit [8]. Other exposures may contribute to asthma-related health outcomes, including cigarette smoke, allergens, and mold [9,10,11,12,13]. An assessment of residential mold contamination was, included in the NEXUS study design
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