Jennifer Ish, Elaine Symanski, David Gimeno Ruiz de Porras, Maribel Casas, George L Delclos, Mònica Guxens, Jesús M Ibarluzea, Carmen Iñiguez, Aitana Lertxundi, Marisa Rebagliato, Michael D Swartz, Kristina W Whitworth
Maternal occupational exposure to chemicals and child cognitive function
Pediatric research
indoor air quality schools elementary primary subject many studies however still relative data regarding preschool 3 5yearold children environments investigation determined concentrations particulate matter pm25 total volatile organic compounds tvoc formaldehyde carbon monoxide co ozone o3 well levels carbon dioxide co2 temperature relative humidity rh indoor outdoor air two preschools situated different geographical regions portugal indoor concentrations tvoc co o3 co2 predominantly higher end school day compared early morning periods tvoc co2 concentrations higher indoors outdoors suggesting predominantly indoor origin outdoor air infiltrations major contributing source co o3 indoor air preschools concentrations pollutants within limits defined national regulations international organizations except tvoc exceeded 812fold higher recommendation 02 mgm3 proposed european commission levels co2 protective guideline 2250 mgm3 portuguese legislation however observed ranges exceeded portuguese margin tolerance 2925 mgm3 end school days indicating impact occupancy rates particularly one preschools regarding comfort parameters temperature exerted significant influence o3 concentrations rh values significantly correlated tvoc levels indoor air preschools particularly late afternoon periods