I think there’s good evidence that large numbers of people have started hearing the Hum for the first time. One classic sign of the Hum is that it is perceived to be louder at night than during the day. The presumed reason for this is that ambient daytime noises mask the Hum, and when the noise of civilization quiets down later at night, the Hum can be much more easily noticed. The COVID-19 pandemic has provided the conditions to test this assumption. Anthropogenic noise around the world is now the quietest it has been in many decades. Air traffic, freeway traffic, and industrial activity and so on have been sharply reduced. And concurrent with this I have been flooded with emails from people who have independently searched for and found the World Hum Map and this blog. They are searching for the source of the noise that many of know all so well. It is also important to note that there are also people writing to me telling me that their hum has stopped. My hypothesis is that those people were not hearing the Hum in the first place, but rather classic acoustic noises that share similarities with the World Hum. The fact that there are far more people in the first category compared to the second, points to this conclusion. I will be very interested to analyze the data that has been reported after the first week of March 2020.
Of course, among those emails are the usual questions about the so-called “sky trumpets”, and so on. It was never my goal to determine the source of those noises, which I am sure are very ordinary, but this seems to be an unintended outcome of this project. You can find my analysis of that topic elsewhere on this blog.