2020 Yes https://www.sciencedirect.com/science/article/abs/pii/S1438463919311654 Haverinen-Shaughnessy, U North America Epidemiology Study Exposure Study Modeling Students Elementary (K-5) Middle/Jr High (6-8) Temperature Humidity Carbon Dioxide (CO2) Carbon Monoxide (CO) Dust Odor Fungi Allergens Absenteeism Respiratory symptoms In Cherokee homes, allergen levels were significantly increased in both control and study groups throughout the study. In Nez Perce homes, dog and cockroach allergen levels decreased significantly in the study homes. The parents reported asthma control test (ACT) scores of the children were significantly improved in both study and control groups, whereas respiratory illness days were reduced in the study group.

In schools, allergen levels, particularly cat, dog and cockroach allergens, increased throughout the year in both study and control schools. However, high contact surface cleaning effectiveness based on adenosine tri phosphate (ATP) readings was improved in the study schools. It was also found that high contact surface cleaning effectiveness may have effects on students’ absence rates tracked by schools.