Hacker conferences—like all conventions—are notorious for giving attendees a parting gift of mystery illness. To combat “con crud,” New Zealand’s premier hacker conference, Kawaiicon, quietly launched a real-time, room-by-room carbon dioxide monitoring system for attendees.

To get the system up and running, event organizers installed DIY CO₂ monitors throughout the Michael Fowler Centre venue before conference doors opened on November 6. Attendees were able to check a public online dashboard for clean air readings for session rooms, kids’ areas, the front desk, and more, all before even showing up. “It’s ALMOST like we are all nerds in a risk-based industry,” the organizers wrote on the convention’s website.

“What they did is fantastic,” Jeff Moss, founder of the Defcon and Black Hat security conferences, told WIRED. “CO₂ is being used as an approximation for so many things, but there are no easy, inexpensive network monitoring solutions available. Kawaiicon building something to do this is the true spirit of hacking.”

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