There's no smoke without fire, so the old saying goes, but in this picture that is not the case.
This is a late 1920s scene of the King George V bridge, which was opened in 1927 to link Oswald Street on the north bank to Commerce Street on the south.
It soon proved popular with commuters and almost everyone in this picture is making their way into the city to start their work. Mind you, the lorry transporting the milk churns is making progress in the other direction, just as that vehicle with the exhaust pouring out heads towards it.
The three-arched bridge took three years to build and cost £130,000. The memorial stone was laid by the King on July 12, 1927.
It was built using reinforced concrete and faced with Dalbeattie granite and was designed to be high enough for small coastal vessels such as 
the busy Clyde puffers to gain access to the Broomielaw Quay further upstream.

Glasgow Times:

When people talk about the power of the press they are usually referring to newspapers. In this instance it is the hard work by women pressing and cleaning clothes at Pullars of Perth, at 50 Busby Road, Clarkston, in 1960