Blue Sunset

In summertime, the blue sunset fills the grey northern sky
Across the grime-covered rooftops, the yellow seagulls do fly
And the grime from the tall factory
Chimneys turns orange, violet and grey
As it rolls away down the river and along the amber trees' bay
And the grime from the tall factory
Chimneys turns orange, violet and grey
And it rolls away down the river and along the amber trees' bay

What makes the blue summer sunset? What turns the northern sky green?
What turns the seagulls to yellow when white is what they should be?
And the smoke from the tall factory
Chimneys, why is it not soily black?
As it sails away down the river
From the top of the tall chimney stack
And the grime from the tall factory
Chimneys turns orange, violet and grey
As it sails away down the river and along the amber trees' bay

I know the blue summer sunset is caused by factory fumes
To fill the sky full of sulphur, turn it greenish from blue
And the sun shines on the birds flying and gives them a yellowy sheen
As it sails away down the river and reflects in the trees moaty stream
And the grime from the tall factory
Chimneys turns orange, violet and grey
And it rolls away down the river and along the amber trees' bay