The south east and Greater London are currently experiencing "very high" levels of pollution, Defra has warned.
Eastern England has been hit with "high" pollution levels so far this morning, Defra's Air Quality Index showed at 9am.
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.