I don’t really leave the house that often, mostly to walk the dog, but I don’t then cuz it’s a huge open air space.
I do on the bus because of how confined it is and how many people use/touch it, but besides that I have no idea.
Do you always have to wear a mask in these places? Or just when there is a covid spike?
How do you even know when there is a covid spike for that matter?
For me it's major public spaces like when I go grocery shopping or in any enclosed space with large congregations of people, if it's outside I just gauge by how often I think I'll be around people and usually have one in my back pocket ready to go.