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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 17 March 2017.

Summary and Weekly Synopsis

Low amounts of early tree pollen will continue to be airborne. Start preparing for the birch pollen season likely to start in late March. 

Tree Pollen - Low

Start preparing for the birch pollen season now if you suffer from birch pollen which is likely to start in late March in the South of the UK. Alder and hazel trees are still emitting pollen but the risk has decreased to low. There are also small amounts of Elm and Ash pollen around.

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. Pleospora (a relative of Alternaria) is now increasing and may trigger some symptoms in those susceptible to these types.

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.