New speed limit restrictions come into force this week on two of the region's busiest routes.
The Welsh Government is reducing the limit on sections of the A483 and A494 from 70mph to 50mph in a bid to reduce pollution on roads where levels are currently above legal limits.
Signs have already been installed on the A483 where restrictions came into force on Tuesday (June 19) and on the A494 where the new speed limit will come into effect from Friday (June 22).
The restrictions in Deeside are between the B5125 St David’s roundabout and the A458 Deeside Park roundabout.
In Wrexham the speed limit will be reduced from the Mold Road interchange (B&Q roundabout) at Junction 5 to the Gresford roundabout.
The Welsh Government added that there were currently no plans to install average speed cameras on the sections of road where the new limits will be in place.
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A spokesman said: “Temporary signs will be installed on the A494 at Deeside on 22 June which is when the 50mph speed limit becomes operational.
“Although there are no plans to install average speed cameras, enforcement will be approached in the same way as other speed limits on the trunk road network, in consultation with the police.”
As reported by the Daily Post the proposals, which form part of five roads in Wales where speeds will be reduced, were announced this year by Welsh Government Environment Minister Hannah Blythyn.
She said: “I am committed to taking action to reduce air pollution in Wales to support a healthier future for our communities and protect our natural environment.
“Current levels of nitrogen dioxide exceed the legal limit at the locations, so we need to act as soon as possible.
“We have been carrying out investigations into all potential measures for reducing nitrogen dioxide levels.
“Our initial studies tell us that 50mph speed limits should have the greatest potential to improve air quality at each location.
“The actions we take to improve air quality in Wales have a key role in supporting the right conditions for better health and wellbeing.”
Poor air quality is said to contribute to an estimated 2,000 deaths per year in Wales.