DEFRA has warned there is a risk of moderate or high levels of air pollution across Lincolnshire tomorrow due to a cloud of Saharan dust, although large uncertainties remain with the timing and amount of dust.
Levels of air pollution are forecast to be low over the UK on Friday, but may become moderate across parts of England and Wales on Saturday.
On Sunday, air pollution levels are forecast to be low across all areas.
The Department for Environment, Food and Rural Affairs (Defra) said adults and children with lung problems, and adults with heart problems, who experience symptoms, should consider reducing strenuous physical activity, particularly outdoors.
Asthma sufferers may also have to use their inhaler more frequently and are being asked to stay indoors.
Saharan dust is a mixture of sand and dust from the vast desert area that covers most of North Africa.
The dust is normally carried west into the Atlantic Ocean but southerly winds can occasionally cause it to drift towards the UK.
Asthma UK Director of Advice, Andrew Proctor, said: “People with asthma need to take extra care.
“We are facing a perfect storm of asthma triggers, with air pollution and weather changes increasing the risk of potentially fatal asthma attacks for millions of people with the condition.”