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Pollen forecast

We produce and supply the pollen forecasts for the UK in conjunction with the Met Office.

Summary and Weekly Synopsis

A moderate risk from grass and oak at the start of this forecast period but decreasing to low for rest of the week.

This forecast was last updated on 22nd May 2015.

Tree Pollen - Moderate

The oak pollen is now in decline and the risk will be moderate decreasing to low. There will be a second peak from a later flowering oak species (Quercus ilex Holm oak) in early June in southern and central regions. 

Grass Pollen - Moderate

Warm weather at the start of this period will allow the early-flowering grass types to release their pollen giving a moderate risk to those near to the sources (grassy meadows uncut lawns). Not all hay fever sufferers are affected by the early types of grass pollen however and the main grass pollen season which affects around 95% of hay fever sufferers is expected to start in early June - so start planning your defence tactics now!


Fungal Spore - Low

Low spore concentrations are expected over this forecast period but the risk will start to increase this month (late May).

For more information on fungal spore allergy click here.

Weed Pollen - Low

Plantain is flowering but the risk will remain low over this forecast period.



Other information

Oilseed rape (Brassica napus) pollen can cause hay fever in a small number of sufferers but Volatile Organic Compounds (VOCs) given off by the crop can cause irritation of the upper respiratory tract and eyes in some people in close proximity to the crop.

For more information on the role of fungal spores in allergy, click here.

For more information on the role of pollen in allergy please see the following pages:

Further Information

Further information on this service can be obtained from Beverley Adams-Groom on 01905 855411.

Forecasts are available on a regional basis to cover the whole of the UK including Northern Ireland. They can also be provided in detail for individual regions.

Daily forecasts are issued from the middle of March to the end of September. Tree pollen forecasts are issued in late spring (late March to Mid May). Grass pollen forecasts are issued from late May to August. Weed pollen forecasts are issued from July to the end of May. Fungal spore forecasts are also available on a daily basis from September to the end of November.

Daily forecasts are featured in newspapers, on radio, on television and various web pages.

All the forecasts are based on information from the quality controlled data produced by the National Pollen Monitoring Network, combined with the information from weather forecasts, local vegetation and typography types and information about biological factors and the weather in the preseason period that influences the amount of pollen produced.