The negatives effect that can be attributed to decrease in air quality is D: increased illnesses that result in a decrease in population.
- Air quality can be regarded as the measurement the cleanliness or how polluted the air is.
- It is very essential to monitor the air quality because polluted air can have a negative effect on our health by causing illnesses, it can cause Catterh and other respiratory disease.
Therefore, option D is correct.
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