Pollen and allergies in Caerdydd
The highest pollen in Caerdydd today is mugwort, at 0.1 grains/m³ — a low level.
Modelled for Wednesday 2 September, 14:00
Pollen in Caerdydd today
| Pollen | Count | Level |
|---|---|---|
| AlderAlnus | 0grains/m³ | None |
| BirchBetula | 0grains/m³ | None |
| OliveOlea | 0grains/m³ | None |
| GrassPoaceae | 0.1grains/m³ | Low |
| MugwortArtemisia | 0.1grains/m³ | Low |
| RagweedAmbrosia | 0grains/m³ | None |
The next 5 days
Daily maximum counts in grains/m³. Only grass and mugwort pollen rise above zero in this window; the rest are out of season.
| Day | Grass | Mugwort | Level |
|---|---|---|---|
| Today2 Sept | 0.1 | 0.1 | Low |
| Tomorrow3 Sept | 0 | 0 | None |
| Friday4 Sept | 0.1 | 0.1 | Low |
| Saturday5 Sept | 0.4 | 0.2 | Low |
| Sunday6 Sept | 0.1 | 0.1 | Low |
This season so far
The highest daily count recorded for each pollen in Caerdydd since 2 June, which puts today's figures in context.
| Pollen | Peak count | Reached on | Level |
|---|---|---|---|
| Grass | 104grains/m³ | Wednesday 24 June | High |
| Mugwort | 50grains/m³ | Wednesday 8 July | High |
What this means for you
Only the most sensitive people will notice symptoms. Normal outdoor activity is fine for almost everyone.
How pollen levels are scored
Thresholds differ by plant, because the amount of pollen it takes to provoke symptoms differs by plant. A count of 20 is a moderate grass day and a very high ragweed one.
| Pollen | Low | Moderate | High | Very high | Usually in the air |
|---|---|---|---|---|---|
| Alder | 1–9 | 10–99 | 100–999 | 1000+ | January to March |
| Birch | 1–9 | 10–99 | 100–999 | 1000+ | March to May |
| Olive | 1–49 | 50–199 | 200–999 | 1000+ | April to June |
| Grass | 1–19 | 20–49 | 50–199 | 200+ | May to August |
| Mugwort | 1–9 | 10–29 | 30–99 | 100+ | July to September |
| Ragweed | 1–9 | 10–19 | 20–49 | 50+ | August to October |
How these figures are produced
These counts come from the Copernicus atmospheric monitoring service, which models pollen concentrations on a grid across Europe, sampled at the coordinates of Caerdydd. They are modelled values rather than grains counted at a pollen trap in the town, so neighbouring localities in the same grid cell will show similar figures, and a tree in flower on your street can matter more than the number here. Treat them as a regional indication. They are not medical advice: if symptoms are severe or persistent, speak to a doctor or pharmacist.
