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• Topic Timeline (Monthly)
• Topic Timeline (Yearly)

	Natural Environment
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Air
	Unusual or Unexpected Event
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Pollution
	Impact on Human Environment
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Radiation
Safety