Wearing a face covering in shops will become mandatory from Friday 24 July.
The measure is to help reduce the risk of transmission of coronavirus.
You could face a fine of up to £100 if you do not comply with the new ruling, which will be enforced by the Police.
Children under 11 and people with certain disabilities will be exempt from the measure. The same applies to wearing a face covering on public transport, which became mandatory on 15 June.
Rather than using surgical masks, passengers can simply cover their mouth and nose with a scarf or other breathable material, the Government has advised.
A face covering should cover your mouth and nose while allowing you to breathe comfortably. When wearing a face covering, take care to tuck away any loose ends. The Government has provided advice on how to wear a face covering and simple ways to make your own face covering at home.
Cllr Sean Donnelly, Knowsley Council Cabinet Member for Health and Social Care, said: “In Knowsley, our advice is to continue to stay at home as much as possible to stop the spread of the virus. You are more at risk of infection in enclosed, public spaces. If you do go to shops or take public transport you are less likely to pass the virus on by wearing a face covering. Social distancing remains vital to preventing the spread of coronavirus, as does washing your hands regularly with soap and water.”
As lockdown restrictions ease and more people return to work we have provided guidance on staying safe and helping restrict the spread of the virus.