Mine is lilacs, because there was a lilac bush at the bus stop that I used to wait at with my mom when I was a kid, it was my school bus stop and the public bus stop so we spent a lot of time on that corner and now when I smell lilacs I just immediately feel like a kid again.
Pinyon juniper woodland after a violent hailstorm. The pulverized vegetation filling the clean mountain air with their volatile compounds. Tart resiny smells mingling with sweet floral sages combined with the earthy aroma of hummus and wet soil. It is petrichor turned up to eleven-thousand.