Since the outlawing of PCB production, PCB in animal tissues has gradually disappeared.
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Q5: Wood-burning is a pollution-free method of heating
Q6: The release of sulfur into the atmosphere
Q7: The process of mining and extracting gold
Q8: New-car smell is caused by off-gassing of
Q9: Mercury is a neurotoxin.
Q11: In pollution treatment, "four nines" means 99.99
Q12: Bioremediation is typically performed by bacteria.
Q13: Many kinds of bacteria consider petroleum edible.
Q14: Leachate is contaminated exhaust released by incineration.
Q15: Phytoremediation is performed by plants.
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