What does "lead sky" symbolize in the poem, "An elementary school classroom in a slum"??

Dear student,
The lead sky in the poem suggests for the heavily polluted environment and air which the slum kids inhale and live in.
The air is filled with smoke and industrial pollutants which are extremely harmful to breathe.
Also, the dark colour of the sky is a symbolism of the indication that the children are going to have a dark and gloomy future.
Regards

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