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On average, it appears that over the past 25 years, improved air quality in the United States has resulted in __________ in the lifespan of the average individual.

A. an increase of one to two days

B. a slight decrease

C. an increase of about five months

D. an increase of about two and one-half years

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Answer:

Answer is C. An increase of about five months.

Explanation:

Air pollution is a situation whereby the air is being contaminated by harmful substances such as carbon {iv] oxide. It is a threat to plants, animals and human health.

Improving air quality is a method to reducing the level of contamination of the air to a reasonable minimum, and in the process extending the lifespan of the resident organisms.

Answer:

C. an increase of about five months

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