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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 24 March 2017.

Summary and Weekly Synopsis

Main tree pollen season moderate to high birch trees now flowering in the southern regions. Ash, elm, alder and hazel also airborne. 

Tree Pollen - High

The main tree pollen season has started in southern counties of the UK with a generally moderate risk but with a localized high risk near to birch trees in flower. The season is expected to be generally milder than last year as quite a few of the birch trees have the risk will be moderate to high on good weather days for 3-4 weeks. Other pollen types around in low to moderate amounts include: ash, elm, alder willow and hazel. The main season in N. England, N.Ireland and Scotland will start soon.

Grass Pollen - Low

The grass pollen season will start in May.


Fungal Spore - Low

All spore types are at currently at low levels. However the air won't be entirely spore free as there will continue to be some penicillium and aspergillus spores airborne that may trigger symptoms in some people.

For more information on fungal spore allergy click here.

Weed Pollen - Low

The weed pollen season will start in the Spring.

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.