Nuclear winter

Impurity: incomplete combustion
Polycyclic aromatic hydrocarbons
Mutagens: known human carcinogens
Dreaded combination of fusion and fission

Aerosol: airborne contaminants
Stratosphere blackened by carbon agglomerates
Explosion: plutonium implosion
Final fissioning of depleted uranium

Fallout: radioactive dust
No shelter secure from the noxious mist
Winter: lack of sunlight
Oxygen lost in the infinite night