Abstract
Lawrence Berkeley National Laboratory (LBNL) conducted a nested, case-crossover-design public school-based study in two different climate regions of California in 2000–2003. This included exploring operating profiles of two mechanical ventilation (HVAC) systems (alternated over a period of approximately nine weeks during 2001 Fall school semester) in pairs of classrooms sited adjacent to one another, equipped with either standard or alternate (low-emissivity) interior finish materials. Our retrospective analysis included inferring estimated indoor ozone concentrations. Because ozone can react with certain indoor pollutants to generate secondary organic aerosols, a mass-balanced based indoor/outdoor ratio expression was used to model indoor ozone to subsequently model indoor particles from possible ozone-initiated chemistry. When Indirect-Direct Evaporative Cooling (IDEC) HVAC was running, surface (especially ceiling) reactions dominated ozone loss processes. When standard Bard heat-pump air-conditioning (HPAC) HVAC system was running, damper setting (air excluded from building envelope), ventilation and/or gas phase reactions accounted for most indoor-outdoor ozone differences. Future research should explore outdoor air and surface chemistry contributions to indoor air pollution.
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