That’s important data. An office is an 8 hour exposure to contained virions. You don’t just get a breath or two walking past someone.
Two videos of what NYC subways look like:
https://www.youtube.com/watch?v=jLVXBeVvp9g June 2020, after reopen
https://www.youtube.com/watch?v=tEc8xatdqOM Dec 2020, the huge winter surge everywhere but NYC, because of this.
Lesson: Govt actions do nothing. Govt mandates do nothing. The only defense is people locking themselves down.
That was a factor. Empty subways and skyscrapers. Also, NYC was hit hard in the initial outbreak in Spring of '20. So people had some partial immunity already. Other places were not hit yet, especially California which suffered the worst of it in winter '20-'21.