Air Quality

• DHH: Why Air Quality Matters
• Wikipedia: Air Quality Index
• Wikipedia: Particulates
• Wikipedia: Indoor air quality
• Wikipedia: Air purifier

• Sensor.community

• PM2.5/PM10 - particles from combustion, exhaust, traffic (wheels against asphalt) etc
• CO, NOx - from traffic exhaust
• CO2 - from humans
• VOC - volatile organic compounds, IIRC correlated with cancer and lots of unpleasant stuff. Comes mostly from paint and manufactured stuff (furniture etc) at home.

Air quality monitoring

• EnviroMonitor
• airgradient