Today's air quality over Cluj in plain words — and, in season, the pollen count — updated through the day.
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A plain-language check on the air over Cluj — and, in season, the pollen count. Updated through the day. It reads a city-wide model, not the corner where you stand, so treat it as the general picture.
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 | 12 grains/m³ |
| Birch | Low | 0 grains/m³ |
| Day | Air quality | Grass pollen |
|---|---|---|
| Fri 31 Jul | Moderate | Low |
| Sat 1 Aug | Fair | Low |
| Sun 2 Aug | Moderate | Low |
| Mon 3 Aug | Fair | — |
Cluj sits in a bowl of the Someșul Mic, and in the cold months that bowl traps still, cold air low over the city. On top of it settles wood and solid-fuel smoke from heating in the ring districts and the surrounding communes, plus traffic and construction dust. IQAir estimates that in the cold season 50–70% of the fine-particle mass over Cluj comes from burning biomass, with transport the single biggest source year-round. The worst readings come on calm, freezing winter days; a windy day clears it fast.
Cluj's yearly PM2.5 has run around 13 µg/m³ in recent measurements — a few times the World Health Organization guideline of 5 µg/m³, and well short of the very worst European cities, but enough that sensitive people feel the bad days. This page is for spotting those days; on most days the air here reads Fair or Good.
Grass pollen peaks in late spring and early summer across Transylvania, with birch earlier in spring. On high days the count is often worst in the early morning and again in the evening, when pollen lifts and settles.
Updated . These are modelled estimates for the area around Cluj-Napoca city centre, not readings from a street monitor — air right beside a busy road can be worse than the area-wide picture. Official forecast: calitateaer.ro. Air quality data by Open-Meteo (CC BY 4.0), based on Copernicus CAMS.