'Cleaner Air for London' are warning of unusually high levels of pollution in London today.
Experts from London Air at King's College London, released this explanation:
Advice for the general public is that anyone who experiences discomfort such as sore eyes, cough or sore throat should consider reducing activity particularly outdoors.
People with lung or heart problems, should reduce strenuous physical exertion, particularly outdoors, and particularly if they experience symptoms. People with asthma may find they need to use their reliever inhaler more often.