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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 14 July 2017.

Summary and Weekly Synopsis

Grass pollen in decline in the southern UK but remaining high in the north. Spores high. Weed pollen moderate.

Tree Pollen - Moderate

Sweet chestnut tree pollen will be airborne affecting a small minority of hay fever sufferers for a couple of weeks to late July.

Grass Pollen - High

There will be a moderately high grass pollen risk in Wales, Scotland, Northern Ireland and northern England. The high risk will continue for another week or two. The season is now in terminal decline in the south, East Anglia and the Midlands, where the risk will be mainly low from now on.

Fungal Spore - High

Alternaria is now in peak season, as well as Cladosporium (released during warm dry weather). Didymella, Tilletiopsis, Sporobolomyces and some basidiospores (both require warm humid conditions) will be airborne too, triggering some asthma and coughing especially during the night and early morning. Other allergenic types will also be airborne.

For more information on fungal spore allergy click here.

Weed Pollen - Moderate

The weed pollen risk is currently at low to moderate levels. Nettle, plantain and dock are currently the main weed allergens airborne. 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.