While prevalent can imply negative occurrences, it's neutral and also describes positive or common things. Smartphones are prevalent among young adults.
Pro Tip 2/3
Time Specific
Use 'prevalent' to talk about things that are widespread during a particular period. Wireless technology is prevalent in this era.
Pro Tip 3/3
Area Specific
Use 'prevalent' to indicate common occurrences or trends in specific locations. Wind energy is prevalent in coastal regions.