Last reviewed June 10, 2026. PurpleAir is widely known for particulate monitoring and its public map ecosystem. PurpleAir Touch is the relevant indoor-facing comparison point, while the broader PurpleAir network is especially useful for outdoor smoke and neighborhood particle context.
Where PurpleAir fits. If the main question is outdoor PM2.5 visibility, neighborhood smoke, or public particle-map contribution, PurpleAir is a familiar and useful category reference.
Where Terrestream differs. Terrestream is built around indoor room interpretation: CO2, IAQ, multiple PM size bins, VOC Index, NOx Index, temperature, humidity, pressure, light, outdoor context, and plain-English recommendations.
Factual distinction. PurpleAir is particle-network forward. Terrestream is indoor-decision forward, with gas-event context, room-by-room scenarios, and an intelligence layer for source likelihood and action.
References
- PurpleAir Touch — archived snapshot (Internet Archive, 2026-06-10) web.archive.org
- PurpleAir - PurpleAir Touch indoor air quality monitor www2.purpleair.com
- PurpleAir - public air quality map map.purpleair.com
- Barkjohn et al. - PurpleAir correction factors doi.org
