Improving the Indoor Air Quality in Nursery Buildings in United Arab Emirates

Area of Science:

• Environmental Health
• Pediatric Health
• Building Science

Background:

• Children have higher inhalation rates and developing immune systems, making them vulnerable to indoor air pollutants.
• Nurseries present unique indoor air quality challenges due to high occupancy and specific activities.
• Existing World Health Organization (WHO) Indoor Air Quality (IAQ) Standards provide benchmarks for assessment.

Purpose of the Study:

• To assess indoor air quality in nurseries and compare it against WHO IAQ standards.
• To identify key indoor air pollutants and their concentration dynamics in nursery environments.
• To evaluate the effectiveness of different IAQ improvement strategies in nurseries.

Main Methods:

• Conducted IAQ measurements in 16 nurseries (35 classrooms) to assess pollutants like CO2, TVOC, TSP, and formaldehyde (CH2O).
• Compared measured pollutant levels with WHO IAQ standards and analyzed daily concentration changes.
• Implemented and evaluated IAQ improvement measures including air purifiers, low-emission materials, and new ventilation systems.

Main Results:

• Concentrations of CO2, TVOC, TSP, and CH2O frequently exceeded WHO IAQ standards.
• CO2 and TSP levels correlated with children's physical activity, while CH2O and TVOC were influenced by ventilation.
• Air purifiers reduced TVOC by 46.4% and TSP by 21.7%. New ventilation systems halved CH2O/TVOC and reduced TSP by one-third.
• Interior renovation with low-emission materials temporarily increased CH2O and TVOC levels.

Conclusions:

• Installation of new ventilation systems is the most effective method for reducing indoor air pollutants in nurseries.
• Air purifiers offer a secondary benefit in reducing specific pollutants like TVOC and TSP.
• Low-emission materials alone are insufficient for immediate IAQ improvement in nursery settings.