Bad air, but bad with what
The headline index hides which pollutant is doing the damage.
Data access
Use the machine-readable JSON record or the flattened CSV download or the compact Markdown version.
Methodology
Median Daily Air Quality Index across every reporting LondonAir site, held separately per pollutant. The single headline figure is each site's worst pollutant, which answers whether the air is bad and hides what it is bad with. Nitrogen dioxide is largely a traffic story and PM2.5 largely a weather one; they neither peak together nor in the same places.
Provenance
- Source
- LondonAir
- Cadence
- live
- Engine
- live-feed
- Licence
- Open Government Licence v3.0