CAL-IN's engineers offer comprehensive indoor air quality investigations and solutions that contain the following elements:

Symptom Description
CAL-IN defines the problem via occupant interviews or by written questionnaires during the initial walk through of the building, the building ventilation system, and adjacent outdoor locations, during which we collect a detailed inventory of potential sources of contaminants.

Potential Source Inspection
During the walk through, CAL-IN also investigates whether there is any potential of exposure to contaminants associated with previous usage of the building. In cases of closed military bases or firing ranges, contaminants such as asbestos or lead have been encountered during the renovation process. Contaminants arising from indoor sources, parking garages, loading docks, and underground areas are also inspected.

Ventilation System Inspection
CAL-IN's air contaminant measurements include assessing the amount of outside air being delivered into the building as well as humidity, temperature and dew point. It is important to measure outside air delivery during the time of the contaminant measurement to ensure the accuracy of the reading, which could result in a false positive that would adversely affect the diagnosis and mitigation plan.

Contaminant Measurements
CAL-IN offers comprehensive building inspections that are in alignment with the physical symptoms reported by building occupants. After a careful review of the potential indoor sources that may be contributing to the occurrence of the reported occupant complaints, sampling and analytical protocols are employed during measurement. CAL-IN refers to the EPA's 1990 "Compendium of Methods for the Determination of Air Pollutants in Indoor Air" which describes methods for measuring nine different classes of pollutants at concentrations commonly encountered in indoor air. ASTM Committee D-22 on Sampling and Analysis of Atmospheres as also published recommended sampling and analytical methods specifically for indoor air. 
 
Data Interpretation & Analysis
CAL-IN gathers all pertinent inspections and measurement information and prepares an analysis of the problem, which is used to formulate the mitigation recommendation. 
 
Mitigation Recommendations
CAL-IN designs and builds HVAC systems that include a number of options (i.e., filtration, dehumidification, humidification, fans, heating, ionizers, uv lights, etc.). Together, we work with subcontractors who install the system to ensure that the equipment is running according to how it was designed. Once the mitigation is complete, a post-mitigation analysis is conducted to measure the effectiveness of the strategy employed. If challenges still persist, additional testing and analysis may be required.

IAQ Presentation-Commercial Buildings 
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