It’s the first of May and the sun is shining all over London; but so is the first wave of grass pollen for the year! For hayfever sufferers, this means itchy eyes, sneezes and “pollen‐fog”.
Grass pollen is Britain’s No. 1 airborne allergen, and the 2025 season is forecast to start slightly earlier after a mild spring. Below you’ll find everything you need to stay a step ahead: when counts will spike, why symptoms feel worse in the capital, and the practical actions (plus professional back-up) that really help.
The 2025 London grass pollen season at a glance
Phase | Approx. dates (London) | Grass-pollen level | What’s happening in the air? |
|---|---|---|---|
Early warning | Mid-May (13 – 24 May) | Moderate | First grasses release pollen after tree season fades. |
First peak | Late May → late June | High → Very high | Main flowering period for rye-grass, timothy & meadow species. |
Lull | Early July (1 – 12 Jul) | Moderate | Rain or cooler snaps can suppress counts briefly. |
Second peak | Mid-July → end July | High | Second flush from later-flowering grasses. |
Tail-off | Aug → early Sept | Low → Very low | Grass release slows; weed pollen takes over. |
*according to Met Office historic averages across London.
The above table is an indication of the various forecasted peaks in grass pollen levels and what you can expect from now until September.
For a more accurate and up to date readings, we also have our pollen count calculator where you can check the pollen count today by postcode anywhere in the UK.
Hayfever symptoms in London
You may sometimes find that your symptoms are worse inside the city compared to being out in the country. The main explanation for this is that pollution + pollen = double effect. The pollen grains tend to stick to air pollutant particles such as heavy fumes,which makes them more irritating to airways. This can cause more severe asthma exacerbations and constant tingling at the back of the throat or cough tendency.
Unlike coastal towns, London also gets little natural “air-washing”, so pollen lingers on still days. Breezes help, but often the combination of pollen with dust and other pollutants help pollen stay at ground level for longer.
Spotting symptoms early
So how do you know if you have an allergy to grass pollen? Well, look out for the following symptoms and if in doubt see your GP or get an allergy testing consultation done.
Symptom | Typical timing | What it can mean |
|---|---|---|
Itchy palate & ears | 1–2 days before nose symptoms | Rising pollen count is triggering histamine release into your blood stream. |
Congested nose on waking | Overnight build-up from open windows | Time to change evening routine and take precautions to minimise pollen from entering your bedroom. |
Raw, tired eyes after commute | Peak rush-hour counts on buses & overground trains | Consider wrap-around eyewear. |
Pro-tip: If raw apples, peaches or celery make your mouth tingle, you may have pollen–food syndrome (cross-reaction between grass proteins and fresh produce). Ask us for an IgE test if you’re unsure or you can do your own ALEX2 allergy test at home.
Five low-effort prevention hacks for city life
Pollen is now everywhere, and we can’t hide inside air conditioned housing all the time. So what can you do to minimise your symptoms?
- Check the pollen count for the day. Enter your postcode and if pollen readings are moderate/ high (4+) try to readjust your schedule for the day. For example, maybe switch your morning run to the gym instead!
- Create a “pollen entry air-lock” at home. Bulletproof your home against pollen. As soon as you enter your home, take your shoes off, put your clothes in a hamper by the door and shower within 20 min. Pollen particles will settle on the clothes fabric so try to avoid spreading this inside your home and especially the bedroom!
- Saline nasal rinse before bed – SinusMed is a brilliant product. A squeezy bottle and pre-mixed sachet cost < £10 and flush pollen grains you breathed in. If you use any nasal spray with steroids or antihistamines, it’s always best to rinse your nasal passages first as this gets rid of any trapped pollen particles.
- Sunglasses + peaked cap = simple shield. This can cut direct contact with your conjunctiva by up to 70 %. It can be especially effective if you get a lot of eye symptoms related to hayfever.
- AC on recirculate in the car – If you have long driving commutes within the M25 or even outside, such as the A40/Blackwall Tunnel, the cabin filter traps far less pollen if you stop drawing air in.
Hayfever Treatment Ladder
Here is a suggested treatment ladder that I recommend to my patients:
Step | What to use | How long to trial | Notes |
|---|---|---|---|
1 | Non-sedating antihistamine tablet (cetirizine/loratadine or fexofenadine [Telfast]) | ↓ symptoms in 1 hr | Take every day during peak pollen season, depending on how problematic it is for you, not “as needed”. |
2 | Sodium cromoglicate eye drops + saline nasal spray | 3–5 days | Safe for kids & pregnancy. |
3 | Prescription steroid nasal spray (fluticasone/mometasone) | 2 weeks | Start two weeks before your usual flare. |
4 | Dual-acting spray (azelastine + fluticasone) | 2 weeks | For breakthrough congestion. |
5 | Immunotherapy for hayfever (sublingual tablets or injections) | 3 yrs | Disease-modifying as it trains your immune system to react less to pollen particles; This is a longer course but it reduces future medication load. We offer various immunotherapy options in my clinic so contact us to find out more. |
When should you book a professional test?
- Symptoms outside grass season – could be tree, weed or mould spores allergy so an allergy test would be most beneficial for you.
- If medication is not touching your symptoms, so if you have to escalate above step 3 above or if your symptoms are very problematic.
- Asthma flare-ups – pollen is a top trigger for spring/summer A&E visits or frequent use of rescue packs.
- Quality-of-life hit – poor exam performance, skipped sports, or chronic sinusitis.
What Holistic Allergy London offers:
- We offer a comprehensive and all in one allergy testing appointment. Based on your history, we can either do skin prick testing or specific-IgE blood tests. You will get the results in 30 minutes or 48 hours.
- Custom desensitization (grass immunotherapy) plans (GRAZAX® tablets, oral drops or SCIT injections). This can be either continuous or preseasonal immunotherapy.
- Expert advice, follow ups or further referral if other consultations are necessary.
Are you ready for a clearer summer?
Contact us and book now to secure your allergy testing consultation in London at our 5 star rated Harley Street clinic or remote.
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