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Mr. Rick DeGardner Lino Lake Police Department Indoor Air Quality and Fungal Sampling Results IHSC Project Number: M20-694 May 6, 2020 Page 6 of 7 Carbon Dioxide Carbon dioxide, a product of combustion and human respiration, is a commonly used indicator of overall air quality and ventilation rates within an occupied building. The levels found in buildings are primarily a function of the rate and amount of outside air delivery to the occupied space, the effectiveness of air distribution within the space, and the occupancy of the space. Moderate to elevated levels of carbon dioxide can cause headaches and fatigue, and higher concentrations can produce nausea, dizziness, and vomiting. Loss of consciousness can occur at extremely high concentrations. To prevent or reduce high concentrations of carbon dioxide in a building or room, fresh air should be supplied to the area. The ASHRAE recommends a CO2 level below 1,000 ppm and OSHA, based on the National Institute for Occupational Safety and Health recommendations of between 600 ppm for minimal air quality complaints, and 1,000 ppm as an upper limit for indoor levels. OSHA also has a Permissible Exposure Limit (PEL) Time Weighted Average (TWA) of 5,000 ppm. The average CO2 levels for both areas were below OSHA minimal air quality complaint level of 600 ppm. Carbon Monoxide Carbon monoxide typically is a product of incomplete combustion, is a chemical asphyxiant at high concentrations, and can cause flu like symptoms that clear up after leaving the contaminated space. The ASHRAE recommends a CO level below 9 ppm in an office setting, and OSHA sets a PEL TWA over an eight -hour period of 35 ppm. The minimum, maximum, and average CO readings for both office areas tested were all 0 ppm. CONCLUSIONS AND RECOMMENDATIONS The results of the fungal spore samples showed that there is not an indoor fungal air quality problem in the two locations that were sampled. All the indoor air quality parameters were also within all regulations and recommendations. The only abnormal results were the fungal tease tape sample collected from the supply diffuser. The black dust/residue had a high concentration of Cladosporium. At a minimum, IHSC would recommend getting the supply diffusers cleaned. Cleaning should be conducted with a high efficiency particulate air filtered vacuum and wet wiping methods to ensure that the fungal spores are not released into the areas below. If after the cleaning the black