Grass pollen is the most common cause of seasonal allergic rhinitis — hay fever — worldwide and in Serbia alike. Of all the pollen types we track, grasses affect the largest share of allergy sufferers: many people who react to nothing else have pronounced trouble with grass.

Why we track grasses as a single category

Grasses (family Poaceae) are wind-pollinated, so during flowering their pollen is present in the air in large quantities. Dozens of species contribute to the total load — among the most common are timothy (Phleum pratense), perennial ryegrass (Lolium perenne), cocksfoot (Dactylis glomerata), and meadow grass (Poa pratensis) — but pelud.net, like most European pollen services, tracks them under one shared category, "Grasses". The reason is the high cross-reactivity within the family: the proteins in the pollen of different grass species are so similar that a sensitized immune system as a rule responds to all of them alike, so splitting them by species would give the allergy sufferer nothing usable. From the same family, though outside the usual category, comes cereal pollen — rye, wheat, maize — which adds to the load in the arable districts of Vojvodina and Mačva in late spring.

Season in Serbia

The grass season is the longest of the six pollen types pelud.net tracks. It runs roughly from May to July, usually peaking in late May and through June. After the main peak concentrations fall away gradually, but mowing and the regrowth of young grass often keep a lower level of exposure going into August — a freshly mown lawn can release a short but noticeable burst of pollen long after the peak has passed.

Mowing is therefore an important local factor. Regular mowing before flowering substantially reduces how much pollen a meadow or lawn releases at all — areas cut early contribute less than untended road verges, neglected plots, and abandoned meadows, where grasses ripen and flower undisturbed. As the grass season fades toward the end of summer, ragweed takes over from mid-August.

Where grasses are most widespread

Grasses grow anywhere with even a little unmanaged soil, so they are present throughout Serbia. The largest areas of meadow, pasture, and arable land carry the heaviest load: Vojvodina (Bačka, Banat, Srem), Mačva and the Sava basin, the valleys of the Velika, Zapadna, and Južna Morava around Kruševac, Kraljevo, and Niš, and Šumadija around Kragujevac. In the mountains of western Serbia the season starts later and is shorter, but the hill meadows around Užice and Valjevo are a generous source of pollen in June and July.

Anyone living beside an untended meadow, a road verge, or farmland with tall grass is as a rule more exposed than a resident of a dense city center.

For cities in Serbia, pelud.net does not measure pollen directly but estimates it from the European CAMS model (via the Open-Meteo service) — see the article on how the risk score is calculated. It is a scientifically grounded estimate rather than a measured value from a local station; pollen measurement in Serbia is carried out by the Serbian Environmental Protection Agency through its network of aeropalynological stations.

Symptoms

  • sneezing and a runny nose
  • blocked nose
  • itchy, watering, red eyes
  • itching of the palate and throat
  • worsening asthma in more sensitive people
  • fatigue and poor concentration from disturbed sleep

Because the season is long, grass symptoms can be more wearing than those of shorter seasons — some allergy sufferers are exposed almost continuously for three months.

Cross-reactivity

Grass pollen cross-reacts across nearly all grass species, which is why we track them as one category — someone allergic to one species is as a rule sensitive to the others.

A minority of patients also have food cross-reactions, though oral allergy syndrome is less pronounced with grasses than with birch. Possible triggers are melon, tomato, peanut, and orange. Reactions are usually mild — itching or slight swelling of the mouth — but it is worth paying attention if unusual symptoms follow those foods during the grass season.

Treatment

  • Second-generation antihistamines are the first choice for sneezing, itching, and discharge.
  • Nasal corticosteroid sprays work best when started before the season, so in late April rather than with the first symptoms.
  • Eye drops help with allergic conjunctivitis.
  • Specific immunotherapy (SLIT or SCIT) for grasses is one of the best-researched and most effective treatments for pollen allergy — in many patients it reduces symptoms and the need for medication over the long term. It runs over several years and is prescribed by an allergist.

Practical tips

  • Follow daily values on pelud.net and, where possible, plan outdoor activity outside the daily peaks.
  • Grass pollen as a rule peaks in the morning and around midday — push running, gardening, and longer walks to late afternoon or evening.
  • If you mow your own lawn, wear a mask and protective glasses if possible; shower and change afterward.
  • Keep windows closed in the morning during the season and ventilate in the evening, when concentrations are lower.
  • After time in the countryside, rinse your face and hair and wash clothing that was in tall grass.

Note

This is not medical advice. For an assessment of symptoms, treatment, or immunotherapy, consult your doctor or an allergist.