Warnings have been issued to people with respiratory illnesses after forecasts that high levels of pollution could affect parts of Northern Ireland this weekend.
The Department of the Environment said moderate levels of air pollution are being forecast across Northern Ireland over the weekend and into Monday, with the possibility of localised high levels on Sunday.
High levels of ozone and particulate matter are expected as a result of local pollution in combination with weather conditions.
A DoE spokesman said: "During periods of high pollution the symptoms of people with lung or heart disease may worsen. Healthy people are unlikely to experience any ill effects. If you think you may be affected by air pollution levels, you should consider modifying your treatment as you usually do when symptoms increase and consult your doctor if this is not effective.
"You may also wish to reduce the time you spend outdoors or avoid busy, congested streets."