This hacker conference installed a literal antivirus monitoring system

Organizers had a way for attendees to track CO₂ levels throughout the venue—even before they arrived.

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[pojo]

I am curious if the organizers offered to pay the venue to install higher efficiency filters for the duration of the conference. That would seem a logical extension of their concern for airborne pathogens.

Higher MERV filters restrict airflow. It makes the HVAC system less effective. So just replacing the filters without other changes may negatively impact the heating/cooling and air circulation.