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Pollen forecast

We produce and supply the pollen forecasts for the UK in conjunction with the Met Office. This forecast was last updated on 26 May 2017.

Summary and Weekly Synopsis

Grass pollen moderate increasing to high across England and Wales in early June. Spores moderate. Tree pollen low.

Tree Pollen - Low

The tree pollen levels are now all low. There will be a short increase in oak pollen from holm oak (Quercus ilex) in a few places where this tree is grown (S. and C. England mainly). Then we will have the lime tree pollen from mid June which affects a minority of hay fever sufferers.

Grass Pollen - High

Initially there will be a moderate grass pollen risk but as more grasses start to flower the risk will increase to high by late May/early June weather permitting in southern and central regions of the UK. In the far North of England and Scotland and Northern Ireland the start of the main season will be a little later.  

Fungal Spore - Moderate

Cladosporium (released during warm dry weather) is on the rise with a moderate risk. Tilletiopsis, sporobolomyces and some basidiospores (both require warm humid conditions) will be airborne too triggering some asthma and coughing.

For more information on fungal spore allergy click here.

Weed Pollen - Moderate

Plantain, dock and nettle pollen are now in flower but the risk will remain low until early June. Weed pollen affects around 20% of hay fever sufferers. 

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.

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 available from the University of Worcester from September to early November. Please contact Beverley on the number above for details.

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.