Record levels of air pollution will continue to parts of the UK, with pollution levels already reaching level nine - high - this morning in the south east, Greater London and eastern England.
Defra ranks air pollution from one to 10, with one being the lowest and 10 the highest.
"Very high" levels of pollution are also forecast later today for the East Midlands.
Higher numbers of complaints about breathing difficulties are thought to have been brought on by record pollution levels in recent days.
Air pollution in the east of England reached the top of the scale as a 'perfect storm' of conditions blanketed parts of the country.
Our region is one of the worst-affected by "very high" levels of air pollution today, with much of the East stuck under a cloud of smog.