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polycyclic aromatic hydrocarbons(5)
lead(4)
mercury(4)
ammonia(3)
nitrogen oxides(3)
pah(3)
particulate matter(3)
pb(3)
pm2.5(3)
sox(3)
dioxins and furans(2)
energy production(2)
hexachlorobenzene(2)
hydrocarbons(2)
pcb(2)
pcdd/f(2)
road transport(2)
aer0sol(1)
aerosols(1)
agriculture(1)
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