The government is ____ air quality tested because high levels of pollution ____ thought to ____ increasing. The government is also having research ____ in schools to try to find out whether air pollution is having any effect on students' performance. Air pollution is known ____ affect health and is estimated to ____ thousands of deaths each year. ____ is also claimed ____ it affects the development of the brain and young people's intelligence, but more research is needed to determine if there is a clear link.

Perspectives 3. Unit 5C. Student book . Exercise 4, p. 137

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