Current levels
4-day forecast
The maximum daily level is shown for each allergen. Levels: 1 (Low) - 5 (Extreme).
Pollen concentration
Za ovaj izvor trenutno je dostupna samo jedna objavljena vrijednost, pa linijski trend ne bi bio pouzdan. Prikazujemo najrelevantnije trenutačne koncentracije.
Measured: Štampar - Zagreb, 09/07
Source: NZJZ "Dr. Andrija Štampar" (stampar.hr)Climate and vegetation
The climate is moderate continental - cold winters and warm, humid summers. The vegetation is varied, dominated by deciduous forests of oak, birch and hornbeam. Large agricultural areas and untended plots along the roads favour the spread of ragweed. Warm spring days with temperatures above 18°C speed up birch flowering, while dry, windy days in August carry ragweed pollen for tens of kilometres.
Main allergens in Continental Croatia
Birch
BetulaApril - Mayhighest concentrations in urban parks and tree-lined avenues
Grasses
PoaceaeMay - Julyaffect almost half of all allergy sufferers
Ragweed
AmbrosiaAugust - Octoberan invasive weed, especially along the A3 motorway and the Sava river
Oak
QuercusApril - Mayyellow pollen deposits on cars in May
Hazel
CorylusJanuary - Marchthe earliest spring allergen, the first sign of the season
Cities in Continental Croatia
The pollen forecast for Continental Croatia covers the following larger urban areas:
Typical symptoms
In Continental Croatia, allergy sufferers most often report hay fever (allergic rhinitis) - sneezing, a runny nose and watery eyes. Symptoms peak in April (birch) and August (ragweed). Asthma often worsens during the birch season. A large proportion of people allergic to birch develop oral allergy syndrome (OAS) reacting to raw apple, pear, hazelnut and celery.
Protection and tips
Follow the pollen forecast and stay indoors in the morning hours during the birch peak (April) and the ragweed peak (August - September). Air conditioners with HEPA filters at home and in the car significantly reduce exposure. In Zagreb, avoid the parks (Maksimir, Tuškanac) during peak flowering. After coming home, shower and wash your hair before going to bed.
Frequently asked questions - Continental Croatia
When does the allergy season start in Zagreb?
The first allergens - hazel and alder pollen - are already in the air in January and February. The main season starts in March with birch and ends in late October with ragweed. The worst months for allergy sufferers in Zagreb are usually April (birch, oak) and August - September (ragweed).
What are the most common allergens in Continental Croatia?
Birch, grasses (Poaceae), oak and ragweed dominate. Štampar's data show that birch pollen concentrations in April regularly exceed 100 grains/m³, and ragweed in September exceeds 20 grains/m³ - already a 'very high' level under the WHO classification.
Where are the highest ragweed concentrations in Croatia?
In Continental Croatia, ragweed is especially widespread in Posavina, around Zagreb and Velika Gorica, and along the roads (A3, A4). Slavonia has even higher concentrations, but Zagreb and its surroundings also regularly experience extreme levels in August and September.
How can I protect myself from birch pollen in April?
Follow the daily pollen forecast, avoid spending time outdoors in the morning and on windy days, use HEPA filters in your air conditioner, and shower as soon as you get home. Start using antihistamines and nasal sprays preventively in late March, before the season peaks.
What is the difference in the pollen season between Zagreb and Slavonia?
Zagreb and Slavonia have a similar seasonal pattern, but Slavonia generally has 30-50% higher ragweed concentrations due to a denser network of farmland and untended plots. Zagreb has higher birch and oak pollen concentrations because of its parks and tree-lined avenues in an urban setting.
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About the data
The current levels for this region come from the public pollen forecast of NZJZ "Dr. Andrija Štampar" (stampar.hr). If measurements are not available, we use Open-Meteo/Copernicus CAMS as a fallback.
- •Source: NZJZ "Dr. Andrija Štampar" (stampar.hr)
- •Coordinates: 45.80°N, 16.00°E
- •Updates: as published by the source, with a fallback to the model forecast
- •Levels: 1 (Low), 2 (Moderate), 3 (High), 4 (Very High), 5 (Extreme)