Share a reading

Step 3 of 4: Your CO₂ number and the room.

For Sacramento Central Library, Sacramento

Your reading

CO₂ in ppm*

A typical room sits 400-2000 ppm. Outdoor air is around 420.

How full was the room?

Pick the closest 5% bucket.Time of day (optional)

Photo (optional)

JPEG or PNG up to 5 MB. We strip EXIF and location data before saving.Notes (optional)

0 / 500. No personal info, please.