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In 2017, the OISE CAO office commissioned an . The survey reviewed common IAQ parameters such as carbon dioxide, carbon monoxide, temperature, relative humidity, total volatile organic compounds (TVOCs) and particulate matter (PM10). Spot measurements and some continuous monitoring data were collected as part of this survey. The purpose of the survey was to provide a general overview of the building, and as with any survey, it is based on conditions present at the time. The survey took place prior to the pandemic and is reflective of pre-pandemic occupancy in the building for that time of the year. Concerns about indoor air quality (IAQ) can be reported to your manager, Chair, or to oisecao@utoronto.ca. The University’s  (Environmental Health and Safety) unit can be contacted to assess the concern and provide recommendations where applicable.

The 2017 survey compared results to standards/guidelines from ASHRAE (America Society of Heating, Refrigerating and Air-Conditioning Engineers), Health Canada and CCOHS (Canadian Centre for Occupational Health and Safety). All air quality results from the survey were within recommended standards/guidelines.  

The University has a team of trained and licensed engineers who operate the ventilation system in the OISE building and who have the training and experience to identify issues/necessary repairs so that the system is working optimally to provide a safe indoor environment for the OISE community. Examples of regular maintenance in the OISE building are: changing air filters at a frequency per manufacturer’s instruction, visual inspections of the ventilation systems including filters multiple times per week, checking to ensure that the filters are sealed (i.e., no gaps), and checking pressure gauges.

It would be difficult to make broad comparisons between residential homes and an office building. Air quality in individual homes will vary greatly depending on the physical environment and/or activities taking place, for example, the presence of pets, chemicals used in the home such as air fresheners and cleaning products, hobbies carried out (e.g. painting, woodworking), the condition/maintenance of furnace, the quality of the filters used, etc.  Similarly, outdoor air quality will vary significantly depending on the location (e.g. business/industries nearby, amount of traffic/vehicles).  

The University is committed to providing a healthy and safe environment for all faculty, librarians, staff and students. Unlike a residential home, the University has a number of policies and procedures that deal with concerns such the , the  to restrict the presence of pets and .  

The University’s team of trained and licensed engineers have the experience to identify issues/repairs so that the system is working optimally to provide a safe indoor environment for the OISE community.  

. In comparison,  shows much higher ACHs in the OISE building:  

Please also refer to the question “What air quality standards are met in the OISE building?” for additional information on maintenance. 

The University has a team of trained and licensed engineers who operate the ventilation system and who have the training and experience to identify issues/repairs so that the system is working optimally to provide a safe indoor environment for the OISE community. As discussed above, the 2017 IAQ survey compared results to standards/guidelines from ASHRAE (America Society of Heating, Refrigerating and Air-Conditioning Engineers), Health Canada and CCOHS (Canadian Centre for Occupational Health and Safety). All results from the survey were within recommended standards/guidelines.  

Any employee who has concerns about air quality in their spaces should report their concerns to the supervisor (or for students, their academic department contact). The University’s  (Environmental Health and Safety) unit can be contacted to assess the concern and provide recommendations where applicable.

Per  (Feb. 2, 2022), there is no evidence that the COVID-19 virus can be transmitted through air ducts.  

In addition, each floor in the OISE building is serviced individually by the ventilation system and all return air goes through filters rated MERV 13 or higher before recirculating. Filters rated MERV 13 or higher have been shown to remove smaller particles in the air, including viruses such as COVID-19. This means that air is not recirculated between floors. For example, if your office is located on the 6th floor, air from the Auditorium is not recirculated to your office.

The OISE building has a central ventilation system that is operated by licensed engineers. This ventilation system provides air circulation and fresh air from the outdoors and is designed to provide the outdoor air supply without windows opening. The amount of outdoor air will vary depending on outdoor temperature to maintain thermal comfort. During extreme seasons (hot/cold), the % outside air supply may decrease to a minimum of 15% to maintain comfortable temperatures in the building. The % of fresh air in the OISE building is common for this type of building. During milder, transitional seasons such as the spring or fall, the building may be “free cooled or heated.” This means that the % outside air supply may increase to 100%.  

In addition, as recommended by public health agencies, filters rated MERV-13 or higher have been installed. Outdoor air circulation has been maximized by disabling the demand control ventilation and performing air flushing two hours before occupancy every morning to replace indoor air with outdoor air.

Air quality will vary depending on the activities and number of occupants in the space. The transient nature of the population using and passing through classrooms could result in greater numbers and density of people in these indoor spaces compared to offices. This is the reason why the University has focussed on ventilation assessments for high density classrooms and have set an internal target of 6 equivalent Air Changes Per Hour (ACHs) for these types of spaces.  

For more information on how outdoor air circulation is being maximized at the OISE building, please refer to “I can’t open any of the windows in the OISE building. What safety measures are in place to ensure adequate air circulation in the building?”

Per the Ontario Occupational Health and Safety Act (OHSA), the JHSC is notified of hygiene testing such as indoor air quality surveys so that a worker member of the JHSC can be present, if desired. The JHSC is also provided a copy of the report. This process was followed during the 2017 indoor air quality survey discussed in question “What air quality standards are met in the OISE building?” 

A copy of the 2017 survey is posted . If you wish to inquire about indoor air quality reports in the future, you can contact the OISE JHSC. A list of members and their contact information is posted on the .

For a summary of the , please refer to “What air quality standards are met in the OISE building?” The parameter that were measured are commonly used parameters for indoor air quality surveys. 

The survey collected a combination of instantaneous (“spot”) measurements and data logging (longer term) measurements using instruments manufactured by TSI and RAE. Both companies have a long history of providing industrial hygiene testing equipment. Calibration certificates showing that the instruments were fit for use (“pass”) are included in the appendices of the report.   

Locations were selected by the consultant to provide an even distribution of measurements across occupied areas. In addition, the consultant included requested locations from the OISE JHSC. Measurements took place both in the morning and in the afternoon (i.e. after several hours of occupancy). All air quality results from the survey were within recommended standards/guidelines, including carbon dioxide. Carbon dioxide levels were still several hundred PPM (Parts Per Million) below the standard even in the afternoon: all but one result (770 PPM) were  less than 700 PPM, compared to the standard of 1122 PPM (based on adding 700 PPM to the background/outdoor carbon dioxide levels at the time of the survey).  

The purpose of the 2017 survey was to provide an overview of the OISE building indoor air quality. The parameters/methodology in the survey are typical for this type of building. In some situations, the parameters/methodology may vary depending on the purpose of the survey and the concerns expressed by the occupant. For example, an office building that is next to a chemical manufacturing plant may have different concerns that need to be investigated using different methods.

OHSA does not specify how frequently indoor air quality parameters such as carbon dioxide should be measured or under what conditions (e.g. normal occupancy) the measurement should be taken. However, the standard practice for measuring carbon dioxide in indoor air quality surveys would be to measure during normal occupancy. Carbon dioxide is naturally present in outdoor air but in office/admin environments, human respiration is an important source of carbon dioxide in addition to outdoor/background levels. To understand if there is their sufficient fresh/outdoor air, carbon dioxide should be measured during normal occupancy, rather than when the room is empty or during low than normal occupancy.  

The , took place prior to the pandemic and is reflective of “normal” (i.e. pre-pandemic) occupancy in the building. The survey compared results to standards/guidelines from ASHRAE (America Society of Heating, Refrigerating and Air-Conditioning Engineers), Health Canada and CCOHS (Canadian Centre for Occupational Health and Safety). All air quality results from the survey were within recommended standards/guidelines.

What impact(s) (if any) does this have on the air quality inside OISE? What impact does this have on the amount of outdoor air delivered to our building? 

Demand-controlled ventilation (DCV) is an energy-saving control strategy that reduces the rate at which outdoor air is delivered to a zone during periods of partial occupancy. In the OISE building, carbon dioxide sensors were installed and when the carbon dioxide levels exceeds 700 PPM, additional outdoor air is introduced into the system. The setpoint of 700 PPM is well below the recommended standard which is equal to the background levels of carbon dioxide + 700 PPM, so roughly 1100 PPM depending on the background levels of carbon dioxide at the location. When carbon dioxide levels are low, outdoor air is reduced and may be reduced to a minimum of 15% outdoor air.  

As part of the , the DCV has been disabled since August 2021 in buildings with these systems, including the OISE building. This prevents a reduction in outdoor air when low levels of carbon dioxide levels (less than 700 PPM) are detected. The result is that outdoor air is maximized in the OISE building. For an explanation of how the % outdoor air fluctuates, please refer to “I can’t open any of the windows in the OISE building. What safety measures are in place to ensure adequate air circulation in the building?”

The equivalent ACH means the number of times the volume of the classroom is cleaned in an hour. A value of ‘6’ equivalent air changes per hour means a room’s entire volume of air is cleaned 6 times an hour.   An explanation of how these calculations are made is provided in of the March 2021 Classroom Ventilation Update, posted in the . 

Regarding the calculations, they were not based on assumptions about outdoor air or filtration. The calculations were made based a damper position of 15% open and with the Merv-13 filter in place.

What has been done to ensure that these filters are appropriately installed to ensure that air does not move around the filters and avoid filtration?  

The OISE HVAC system utilizes MERV-13 filters as recommended by public health organizations. For more information, please refer to “How can I learn more about classroom/central ventilation upgrades at OISE and other UofT buildings?” 

The MERV-13 filters were in place during the air audit summarized in to the OISE JHSC about the OISE HVAC system to the JHSC. 

Regular inspections are conducted by UofT’s team of experienced and licensed building engineers to ensure there are no gaps around filters.

How do we find out when the filter was last replaced/inspected? 

Filters in the central ventilation system are replaced annually or per manufacturer’s instruction, whichever is more stringent.  

For air purifiers units installed in classrooms by F&S, the units have a red indicator light to trigger an inspection. Caretaking checks for the indicator light daily. If the indicator light is red, Caretaking will issue a service order to Utilities who will inspect the unit and determine if the filter needs to be replaced.  

If you see a red indicator light on an air purification unit, you can also contact Facilities & Services (416-978-3000). If you or the JHSC have questions about when the inspections, please contact OISE Facilities & Services or EHS.

Do public health guidelines recommend CO2 to be measured before returning to in-person activities? 

For more details on indoor air quality including carbon dioxide, please refer to “What air quality standards are met in the OISE building?”  

Carbon dioxide is a frequently used parameter to assess if there is sufficient outdoor air for general indoor air quality purposes. However, it is not a direct indicator of COVID-19.  

Neither Toronto Public Health nor Health Canada specifically recommend CO2 levels to be measured in their guidance regarding ventilation systems. These agencies do recommend regular maintenance/inspections, maximizing outdoor air where possible and upgrading filtration where possible. The University’s aligns with these recommendations.

Per the recent , building occupants who have questions or would like to request information the building ventilation and when inspections are done a system should contact the OISE JHSC (listing posted on the ). EHS will assist in facilitating discussions between the JHSC and the facilities group to obtain the requested information (where the information is available).

For a review of airflow and air changes per hour (ACH) information in the OISE building, please refer to “How does the air quality in the OISE building compare to my home?” 

Examples of how the University’s team of qualified engineers maintains optimal air quality standards in the OISE building are provided in “What air quality standards are met in the OISE building?”

Have you considered sampling and continuous monitoring on each floor of the OISE building for specific types of chemical compounds and hazards (e.g., formaldehyde, mold, asbestos, volatile organic compounds (VOCs), etc.)?

Please report any health and safety concerns to your supervisor. EHS can be contacted to assess the concern and determine next steps regarding air sampling or recommendations where applicable.  

The type of air sampling that is conducted is dependent on the concerns and risks present. The University has a number of programs and policies in place to address potential hazards. For example: 

• Formaldehyde and VOCs could be a concern in areas that have undergone new construction (e.g. new building materials, paints/coatings used during the construction, new furniture). However, this is proactively addressed  by to limit VOCs for all construction and renovation projects.  

• Mould is naturally present in the indoor and outdoor environment. However, mould growth/amplification is associated with moisture problems (e.g. roof or plumbing leaks). Buildings are managed to prevent water issues/mould growth and procedures are in place to safely address mould growth if present (please refer to the ). 

• Asbestos is present in many buildings in Canada (e.g. schools, hospitals, residential homes, shopping centres, etc.) and naturally present in background levels of outdoor air. Asbestos has been linked with harmful illness (e.g. mesothelioma, a type of cancer) in asbestos workers such as trades workers and construction workers, due to the nature of their work, worked regularly with asbestos materials (e.g. grinding, cutting, drilling, etc.).  Simply working in a building with asbestos does not mean you are exposed to harmful levels of asbestos.  The University’s outlines the processes that are in place to ensure that our buildings are safe.  

Sampling is not always necessary to identify the hazards. For example, the University maintains an asbestos inventory. Combined with visual inspections, the asbestos inventory is an effective tool in identify whether damaged to asbestos-containing materials had occurred (or not).  

You can also contact the OISE JHSC (contact information posted on the ) for assistance.

If you have any concerns about indoor air quality (IAQ), please report the concern to your manager, Chair, or to oisecao@utoronto.ca. Similar to other health and safety concerns, those in supervisory roles have responsibilities for health and safety in the workplace and workers are responsible for reporting hazards. EHS (ehs.office@utoronto.ca) is also available to provide support and conduct an assessment to identify workplace hazards and provide recommendations to address concerns.

As part of the University’s response to the pandemic, the was developed and implemented by the University.  

You can see a list of assessed classrooms on the webpage.  

You can also review the building filtration information (e.g. Merv-13 filters) on the webpage. All OISE-related buildings (252 Bloor St. W., 371 Bloor St. W., JICS) have all been fitted with MERV-13 or higher filters.