Because there is a sewer that runs alongside this part of the Brunette River. Underground, of course, but occasionally you can smell its fragrant odor wafting by.
I was originally going to crop my feet out of the shot, but my feet are almost a meme in my photos at this point, so I kept them in. It was about 30C when I took this shot. I have probably had enough 30C days for this summer. I don’t think Mother Nature is listening, though.