# Large-scale concentration maps (GCN)

Modelled annual averages of nitrogen dioxide and particulate matter for the whole country, in one-kilometre cells. Where Luchtmeetnet measures, GCN fills in between stations.

- Publisher: Rijksinstituut voor Volksgezondheid en Milieu
- Area: Netherlands · Finest detail: 1 × 1 km
- Period: 2006 – 2025 · Refreshed: yearly
- Access: Open · Licence: CC BY 4.0
- Join keys: coördinaten (RD)
- Status: grijs
- URL: https://www.rivm.nl/gcn-gdn-kaarten

## What can you do with it?
- **How clean is the air at my address?.** Find the one-kilometre cell containing your address and read the annual mean.
- **Twenty years of cleaner air.** Compare the 2006 map with today's. Where did nitrogen dioxide fall the most?

## Interesting combinations
- Do low-income people more often live in polluted air? → [cbs-kwb](https://www.opendataindex.nl/en/bron/cbs-kwb.md) via coördinaten → buurt. Average the grid per neighbourhood and compare with income.

## Similar sources
- [luchtmeetnet](https://www.opendataindex.nl/en/bron/luchtmeetnet.md): Real hourly measurements, but only at stations.