Clean Air Day was marked in Southwark by an idling action event outside The Shard, whilst nearby Redcross Way was closed to traffic and given over to street games for the afternoon.
To celebrate national Clean Air Day, Cllr Richard Livingstone, Southwark's cabinet member for environment, transport management and air quality, joined passers-by in a game of air quality-themed snakes and ladders on a giant board that highlighted actions that affect air quality positively (ladders) and negatively (snakes).
He also joined the council's air quality team to talk to drivers, asking them to turn off their engines when stationary.
Cllr Livingstone said: "It's so important that we all pull together to tackle London's air quality crisis and Clean Air Day provides a great opportunity to get the important conversation about what we can all do to help, moving along.
"Here in Southwark we're working with everyone from motorists and developers to educators and residents, and doing our best to help improve London's air."
Air Quality Day was also marked in Bankside: Redcross Way became a 'Play Street' for the afternoon, hosting games of kerby as part of the Merge Festival.