DERBYSHIRE FOG ALERT: Extreme pollution sparks road and health warnings
Government agency Defra said a mix of local and European emissions and dust from the Sahara is creating moderate to high pollution levels across the area.
The elderly and those with lung or heart disease are being urged to avoid strenuous exercise outside. Drivers are being told to take extra care.
Andrew Sibley, of the Met Office, said: “Conditions are going to get worse as we go through Wednesday and the rest of the week.”