In urban areas you probably can just have the whole-house surge protector and skip the rest, since that protects all costly electronics not just a single device. With just a surge strip on the PC I'd say you're a tad under-protected, yeah.
Incidentally whole-house surge protection is now required by code in new houses. Existing buildings aren't required to upgrade, but by my reasoning what's good for the goose is good for the gander.
Commercial uses layered surge protectors (Type I, II, and III), which is also recommended for other users but rarely followed.
In surge prone areas, at a minimum I would have good quality whole-house surge protector (eg Siemens 140 or Eaton 108), and a good quality surge protector strip for any computer/TV/phone charger.
I also put surge protectors in front of expensive white goods like the fridge, washer/dryer, dishwasher, and garage door opener. Besides being costly to replace these can contain "sparky" motors and this provides protection in the other direction too. Over time smaller surges can degrade the main surge protector for your computer.
Nothing (reasonable) can protect against direct lightning strikes, but for anything less it should provide decent protection.
> reduce something that has been shown to be correlated with negative long term health outcomes
Are you suggesting the link isn't causal? Because your argument only makes sense if you think air pollution particles aren't actually the cause of lung damage, which is the opposite of the scientific consensus.The fact that you have to bring up amyloid plaques is especially a red flag, since this is famously a rare example of the failure of scientific consensus.
>I think not using an ultrasonic humidifier would be better stated as only using distilled water with ultrasonic humidifiers
That's a common misconception. They still atomize bacteria from the tank because nobody ever cleans & sterilizes their dehumidifier tank often enough. Distilled water users still report high indoor particle counts when it runs, which is how you know it's an ineffective prevention.The cost of distilled water every year (even making it at home) means ultrasonic humidifiers are the most expensive option too.
Just use an evaporative pad humidifier.
https://www.youtube.com/watch?v=oHeehYYgl28
>while there are lots of studies showing population level correlations between pm2.5 particles and health problems, I don't think there is currently evidence specifically showing that things like using air purifiers actually improve health.
Air purifiers reduce PM2.5 concentration, so if PM2.5 is bad for health then air purifiers are good for health.This is like "there's no evidence parachutes improve survival after jumping from a plane."