AP Environmental Science | The Clean Air Act | Literacy + Graphing (Print & Go!) Grades: 9–12 Subjects: Environmental Science, Earth Science, Biology Resource Type: Reading Comprehension, Graphing Activity, Critical Thinking Reflection Formats Included: PDF Bring environmental policy to life with this engaging, standards-aligned activity set centered on the Clean Air Act. Students begin with a high-interest reading passage that introduces the history, purpose, and impact of the Clean Air Act.