Which of the following has contributed to longer life spans in the United States?
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.
Based strictly on increases in air pollution over the past few decades, where would we expect to see the greatest decrease in life spans? We would expect to see a decrease in life span in __________.
Which of the following describes the greatest health risk posed by air pollution? Air pollutants __________.
All of the listed responses are correct.
an increase of about five months
Beijing, China
damage blood vessels in human lungs