Motive is related to Purpose. Purpose is related to Transport. Transport is related to Road. Road is related to Passage. 
Dare is related to Danger. Pollution is a type of Danger. 
Motive <--RelatedTo--> Purpose <--RelatedTo--> Transport <--RelatedTo--> Road <--RelatedTo--> Passage 
Dare <--RelatedTo--> Danger <--IsA-- Pollution 