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Today's air quality — and in season, pollen — in plain language, updated hourly.
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Fair Fine for being outside, including exercise, for almost everyone.
Peak modelled counts for today. Hay fever symptoms typically start when counts pass about 50 grains/m³ — grass is the one that affects most people in the UK (May–July); birch is a spring tree pollen (March–May).
| Pollen | Level | Peak today |
|---|---|---|
| Grass | Low | 0 grains/m³ |
| Birch | Low | 0 grains/m³ |
| Day | Air quality | Grass pollen |
|---|---|---|
| Mon 19 Oct | Moderate | Low |
| Tue 20 Oct | Moderate | Low |
| Wed 21 Oct | Moderate | Low |
| Thu 22 Oct | Fair | — |
Delft sits on the open Randstad plain, where wind carries pollution from the wider Rotterdam–The Hague conurbation — a real factor for the city's many cyclists.
Updated . These are modelled estimates for the area around Delft, not readings from a street monitor — air right beside a busy road can be worse than the area-wide picture. The official index where you are is the European Air Quality Index. Air quality data by Open-Meteo (CC BY 4.0), based on Copernicus CAMS.
Fair
European Air Quality Index 23 · Delft