1. Monitor CO2 levels: Measuring Carbon Dioxide (CO2) is the best way to judge the amount of exhaled air in an indoor space; higher levels of CO2 indicate a higher percentage of the air in a room has already been breathed by someone else. Publicly viewable CO2 monitoring devices should be installed in all government/business/public shared indoor spaces (“indoor spaces”). Indoor CO2 levels should not exceed 800 PPM (if no filtering is used) or 1000 ppm, if significant HVAC or portable HEPA filtering is in use.³

2. Enforce occupancy limits: All indoor spaces must specify occupancy limits based on the ability to ventilate the space to target CO2 levels.

3. Address inadequate ventilation: If an indoor space exceeds the target CO2 limit, the relevant entity must take at least one of the following actions to bring the space into compliance: 1) reduce the maximum occupancy level of the space; 2) improve natural or mechanical ventilation of the space; OR 3) install portable HEPA air cleaners. Number and size of cleaners to be determined based on size, layout, function, and occupancy of space.⁴

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