I think this is hyperbole for the majority of people who do not have existing respiratory or other health conditions.
Air quality in SF proper was only bad (by which I mean Unhealthy for Sensitive Groups or above) for roughly a month this year. That certainly doesn't warrant having HEPA filters and P100 masks now in October/November (again, for most people).
Air quality in SF proper was only bad (by which I mean Unhealthy for Sensitive Groups or above) for roughly a month this year. That certainly doesn't warrant having HEPA filters and P100 masks now in October/November (again, for most people).