Grass Pollen Count in Ortho, Belgium
Last updated Sunday, November 8, 2026
This page shows the most recent reading available for Ortho — from Sunday, November 8, 2026 (1 day ago) — not today's reading.
Pollen by type in Ortho
What is the grass pollen count in Ortho today?
The Ortho grass pollen index today is 0.6 (Low) on Pollen Atlas’s modelled 0–100 scale. Low
Modelled pollen risk index — not a measured count.
Ortho’s overall pollen count today is 10 (Low) across all types. See the full Ortho pollen count for the overall index and every type together.
Ortho is in Province du Luxembourg, Wallonia, Belgium. Its population is 939 (GeoNames).
Ortho Grass Pollen Count: 5-Day Forecast
| Day | Overall index | Category |
|---|---|---|
| Sunday, November 8 | 10 | Low |
| Monday, November 9 | 9 | Low |
| Tuesday, November 10 | 6 | Low |
| Wednesday, November 11 | 5 | Low |
| Thursday, November 12 | 8 | Low |
Pollen Atlas models the daily detail as an overall index: day-by-day splits by individual pollen type are not part of the modelled data, so this table shows Ortho’s overall trend across the week. Today’s grass pollen reading is the headline above.
Species driving Ortho’s grass pollen
The modelled data reports grass as one combined index — there is no species-by-species split for grass anywhere in the data, so this page does not invent one. Today’s modelled grass index for Ortho is 0.6 (Low), and the 5-day overall trend above shows the shape of the week.
As regional context only — not as today’s readings — in the Continental West pattern, the plants that typically shape this city’s year are early hazel and alder, a birch-led spring, late-spring grasses, and late-summer mugwort and ragweed.
Plants affecting Ortho now — grass pollen
Detailed plant-by-plant readings for the grass pollen category were not returned in today’s source data for Ortho. The type summary stands: grass pollen reads 0.6 (Low) today.
In the Continental West pattern, the plants that typically shape this city’s year are early hazel and alder, a birch-led spring, late-spring grasses, and late-summer mugwort and ragweed — named here as regional context only, not as today’s readings.
Plant detail returns here automatically on any day the feed includes it.
What this grass pollen level means
Low risk. Keep windows open; consider allergy meds only if sensitive.
Enjoy outdoor activities.
Grasses hold from May through July, cresting in late May and June. This month sits outside the usual grass pollen window for the Continental West pattern, so today’s grass pollen reading is the modelled value outranking the calendar — this page reports the modelled reading first. No Belgium allergy season guide is published yet, so the seasonal context here follows the Continental West regional pattern.
Ortho allergies today
Ortho allergies today are set by the same reading as the Ortho pollen count today: the Total Pollen Index is 10 (Low), and the grass pollen index on this page is 0.6 (Low) of it. When people ask about Ortho allergies, this is the number that answers them — one daily modelled index built from today’s tree, grass and weed index values for Ortho.
Allergies in Ortho follow the Belgium calendar set out on the full Ortho page — the chapters, the plants behind them, and the 5-day forecast show whether today is typical for the season or an exception to it. If you are checking allergies today in Ortho before heading outdoors, the grass pollen split on this page is the part to read: it shows whether this pollen type is doing the work today, not just how high the total sits.
Read the five-day overall trend above as the Ortho allergy forecast for the grass pollen season: it shows whether Ortho allergies are set to ease or build across the week, day by day — the days to plan outdoor time around are the ones where the overall index steps down, not just today.
See the full Ortho pollen count — all types, the overall index and today’s ranking context
See how Ortho ranks in today's pollen count rankings — the worst cities for allergies today
Every pollen type, with photos and seasons: the pollen directory
Pollen indexes: a modelled pollen risk index computed by Pollen Atlas from open weather, vegetation and phenology data, calibrated against CDC/NAB season data. Plant detail: Google Pollen API. Index values are modelled, not measured counts. Sources: CDC/NAB; USA-NPN; GBIF (CC BY); ESA WorldCover (CC BY 4.0).