0 • A • B • C • D • E • F • G • H • I • J • K • L • M • N • O • P • Q • R • S • T • U • V • W • X • Y • Z
1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Lead 6: Human 7: Water 8: Environment 9: Range 10: Current 11: Condition 12: Process 13: Atom 14: Fishery 15: Electricity 16: Carbon 17: Contamination 18: Plant 19: Hazard 20: Conservation (As of 05:37)
--->Criteria air contaminants
