High air pollution levels affect parts of north Wales
High levels of air pollution are affecting parts of north Wales, according to experts.
Flintshire, Wrexham and areas along the border in mid Wales are reported to have high or moderate levels of pollution.
Levels in Flintshire have reached eight out of 10 on the Met Office scale.
Vulnerable people with lung and heart conditions, as well as those with asthma, have been urged to take care, by Public Health Wales (PHW).
Flintshire council has issued advice to schools over the pollution, which has been blamed on a combination of local emissions and dust blown over from the Sahara desert.
Huw Brunt, consultant in environmental health protection for PHW, said: "While most people will not be affected by short term peaks in air pollution, some individuals, particularly vulnerable groups such as those with existing heart or lung conditions, may experience increased symptoms.
"On occasions where levels are high, adults and children with lung problems and adults with 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. Older people should also reduce physical exertion."