Background: Recall that air pollution is due to chemical substances and particles released into the air mainly by human actions. When most people think of air pollution, they think of the pollution outdoors. But it is just as easy to have indoor air pollution. Your home or school classroom probably doesn't get much fresh air. Sealing up your home reduces heating and cooling costs. But this also causes air pollution to stay trapped indoors. And people today usually spend a majority of their time indoors. So exposure to indoor air pollution can become a significant health risk.

Situation: James spent a lot of time indoors, and didn't get out much like Rob, his friend, who loved outdoors stuff.

Question: Which friend was more exposed to outdoor pollution?
Answer: Rob

Situation: James spent a lot of time indoors, and didn't get out much like Rob, his friend, who loved outdoors stuff.

Question: Which friend was less exposed to outdoor pollution?
Answer: James

Situation: James spent a lot of time indoors, and didn't get out much like Rob, his friend, who loved outdoors stuff.

Question: Which friend was less exposed to indoor pollution?
Answer: Rob

Situation: James spent a lot of time indoors, and didn't get out much like Rob, his friend, who loved outdoors stuff.

Question: Which friend was exposed more to indoor pollution?
Answer: James

Situation: James spent a lot of time indoors, and didn't get out much like Rob, his friend, who loved outdoors stuff.

Question: Which friend was exposed more to chemical substances?
Answer: James

Situation: James spent a lot of time indoors, and didn't get out much like Rob, his friend, who loved outdoors stuff.

Question: Which friend was exposed less to chemical substances?
Answer: Rob

Situation: James spent a lot of time indoors, and didn't get out much like Rob, his friend, who loved outdoors stuff.

Question: Which friend breathes more fresh air on a daily basis?
Answer: Rob

Situation: James spent a lot of time indoors, and didn't get out much like Rob, his friend, who loved outdoors stuff.

Question: Which friend breathes less fresh air on a daily basis?
Answer: James

Situation: James spent a lot of time indoors, and didn't get out much like Rob, his friend, who loved outdoors stuff.

Question: Which friend breathes less stale air on a daily basis?
Answer: Rob

Situation: James spent a lot of time indoors, and didn't get out much like Rob, his friend, who loved outdoors stuff.

Question: Which friend breathes more stale air on a daily basis?
Answer: James

Situation: Two twin sisters, Bianca and Rosa, were exposed to high levels of air pollution. While Bianca was exposed mostly to indoor pollution, Rosa was heavily exposed to outdoor pollution.

Question: Which sister was more exposed to home air pollution?
Answer: Bianca

Situation: Two twin sisters, Bianca and Rosa, were exposed to high levels of air pollution. While Bianca was exposed mostly to indoor pollution, Rosa was heavily exposed to outdoor pollution.

Question: Which sister was less exposed to home air pollution?
Answer: Rosa

Situation: Two twin sisters, Bianca and Rosa, were exposed to high levels of air pollution. While Bianca was exposed mostly to indoor pollution, Rosa was heavily exposed to outdoor pollution.

Question: Which sister was less exposed to air pollution from school?
Answer: Rosa

Situation: Two twin sisters, Bianca and Rosa, were exposed to high levels of air pollution. While Bianca was exposed mostly to indoor pollution, Rosa was heavily exposed to outdoor pollution.

Question: Which sister was more exposed to air pollution from school?
Answer: Bianca

Situation: Two twin sisters, Bianca and Rosa, were exposed to high levels of air pollution. While Bianca was exposed mostly to indoor pollution, Rosa was heavily exposed to outdoor pollution.

Question: Which sister was more exposed to air pollution because of cutting cooling costs?
Answer: Bianca

Situation: Two twin sisters, Bianca and Rosa, were exposed to high levels of air pollution. While Bianca was exposed mostly to indoor pollution, Rosa was heavily exposed to outdoor pollution.

Question: Which sister was less exposed to air pollution because of cutting cooling costs?
Answer: Rosa

Situation: Two twin sisters, Bianca and Rosa, were exposed to high levels of air pollution. While Bianca was exposed mostly to indoor pollution, Rosa was heavily exposed to outdoor pollution.

Question: Which sister was less exposed to air pollution because of cutting heating costs?
Answer: Rosa

Situation: Two twin sisters, Bianca and Rosa, were exposed to high levels of air pollution. While Bianca was exposed mostly to indoor pollution, Rosa was heavily exposed to outdoor pollution.

Question: Which sister was more exposed to air pollution because of cutting heating costs?
Answer: Bianca

Situation: Two twin sisters, Bianca and Rosa, were exposed to high levels of air pollution. While Bianca was exposed mostly to indoor pollution, Rosa was heavily exposed to outdoor pollution.

Question: Which sister got more fresh air?
Answer: Rosa

Situation: Two twin sisters, Bianca and Rosa, were exposed to high levels of air pollution. While Bianca was exposed mostly to indoor pollution, Rosa was heavily exposed to outdoor pollution.

Question: Which sister got less fresh air?
Answer: Bianca

Situation: Patty was a runner and liked hiking so she spent a lot of time outdoors. Her friend Fay sealed up her home and spent most of her time indoors. Both friends lived in an area with moderate to high levels of air pollution and attended a seminar where they learned more about the impact of air pollution on human health.

Question: Which friend was exposed to more outdoor pollution?
Answer: Patty

Situation: Patty was a runner and liked hiking so she spent a lot of time outdoors. Her friend Fay sealed up her home and spent most of her time indoors. Both friends lived in an area with moderate to high levels of air pollution and attended a seminar where they learned more about the impact of air pollution on human health.

Question: Which friend was exposed to less outdoor pollution?
Answer: Fay

Situation: Patty was a runner and liked hiking so she spent a lot of time outdoors. Her friend Fay sealed up her home and spent most of her time indoors. Both friends lived in an area with moderate to high levels of air pollution and attended a seminar where they learned more about the impact of air pollution on human health.

Question: Which friend was exposed to less indoor pollution?
Answer: Patty

Situation: Patty was a runner and liked hiking so she spent a lot of time outdoors. Her friend Fay sealed up her home and spent most of her time indoors. Both friends lived in an area with moderate to high levels of air pollution and attended a seminar where they learned more about the impact of air pollution on human health.

Question: Which friend was exposed to more indoor pollution?
Answer: Fay

Situation: Patty was a runner and liked hiking so she spent a lot of time outdoors. Her friend Fay sealed up her home to save money on energy and spent most of her time indoors. Both friends lived in an area with moderate to high levels of air pollution and attended a seminar where they learned more about the impact of air pollution on human health.

Question: Which friend saved more money on cooling costs?
Answer: Fay

Situation: Patty was a runner and liked hiking so she spent a lot of time outdoors. Her friend Fay sealed up her home to save money on energy and spent most of her time indoors. Both friends lived in an area with moderate to high levels of air pollution and attended a seminar where they learned more about the impact of air pollution on human health.

Question: Which friend saved less money on cooling costs?
Answer: Patty

Situation: Patty was a runner and liked hiking so she spent a lot of time outdoors. Her friend Fay sealed up her home to save money on energy and spent most of her time indoors. Both friends lived in an area with moderate to high levels of air pollution and attended a seminar where they learned more about the impact of air pollution on human health.

Question: Which friend saved less money on heating costs?
Answer: Patty

Situation: Patty was a runner and liked hiking so she spent a lot of time outdoors. Her friend Fay sealed up her home to save money on energy and spent most of her time indoors. Both friends lived in an area with moderate to high levels of air pollution and attended a seminar where they learned more about the impact of air pollution on human health.

Question: Which friend saved more money on heating costs?
Answer: Fay

Situation: Patty was a runner and liked hiking so she spent a lot of time outdoors. Her friend Fay sealed up her home to save money on energy and spent most of her time indoors. Both friends lived in an area with moderate to high levels of air pollution and attended a seminar where they learned more about the impact of air pollution on human health.

Question: Which friend spent more time breathing fresh air?
Answer: Patty

Situation: Patty was a runner and liked hiking so she spent a lot of time outdoors. Her friend Fay sealed up her home to save money on energy and spent most of her time indoors. Both friends lived in an area with moderate to high levels of air pollution and attended a seminar where they learned more about the impact of air pollution on human health.

Question: Which friend spent less time breathing fresh air?
Answer: Fay

Situation: Two neighboring cities had very different health related problems. Twin city had increased air pollution, their people experiencing all kinds of respiratory diseases, while Pine city had problems with age related diseases.

Question: Which city had more people exposed to chemical substances released into the air by human actions?
Answer: Twin

Situation: Two neighboring cities had very different health related problems. Twin city had increased air pollution, their people experiencing all kinds of respiratory diseases, while Pine city had problems with age related diseases.

Question: Which city had fewer people exposed to chemical substances released into the air by human actions?
Answer: Pine

Situation: Two neighboring cities had very different health related problems. Twin city had increased air pollution, their people experiencing all kinds of respiratory diseases, while Pine city had problems with age related diseases.

Question: Which city had fewer people exposed to chemical particles released into the air by human actions?
Answer: Pine

Situation: Two neighboring cities had very different health related problems. Twin city had increased air pollution, their people experiencing all kinds of respiratory diseases, while Pine city had problems with age related diseases.

Question: Which city had more people exposed to chemical particles released into the air by human actions?
Answer: Twin

Situation: Two neighboring cities had very different health related problems. Twin city had increased air pollution, their people experiencing all kinds of respiratory diseases, while Pine city had problems with age related diseases.

Question: Which city had more people exposed to outdoor pollution?
Answer: Twin

Situation: Two neighboring cities had very different health related problems. Twin city had increased air pollution, their people experiencing all kinds of respiratory diseases, while Pine city had problems with age related diseases.

Question: Which city had fewer people exposed to outdoor pollution?
Answer: Pine

Situation: Two neighboring cities had very different health related problems. Twin city had increased air pollution, their people experiencing all kinds of respiratory diseases, while Pine city had problems with age related diseases.

Question: Which city had fewer people exposed to indoor pollution?
Answer: Pine

Situation: Two neighboring cities had very different health related problems. Twin city had increased air pollution, their people experiencing all kinds of respiratory diseases, while Pine city had problems with age related diseases.

Question: Which city had more people exposed to indoor pollution?
Answer: Twin

Situation: Two neighboring cities had very different health related problems. Twin city had increased air pollution, their people experiencing all kinds of respiratory diseases, while Pine city had problems with age related diseases.

Question: Which city had more people exposed to home or school classroom pollution?
Answer: Twin

Situation: Two neighboring cities had very different health related problems. Twin city had increased air pollution, their people experiencing all kinds of respiratory diseases, while Pine city had problems with age related diseases.

Question: Which city had fewer people exposed to home or school classroom pollution?
Answer: Pine