@canigooutyet
Medics are exposed to a much higher risk of infections, simply because they work in healthcare settings.
Joe Bloggs on the street is also exposed to a risk, but not as high as medics.
There was a shortage of surgical masks earlier this year. Depending on where you are, there may still be a shortage. I live in Asia, where it is now very easy to buy a box of 50 surgical masks from any pharmacy, and of course you can buy them online. However, back in January/February, they were impossible to find. eBay stopped selling them, and many manufacturing countries including India made it illegal to export them.
Because of the global shortage of surgical masks, the UK government asked the population not to buy surgical masks, to ease the pressure and allow PPE to be provided to health professionals as a priority. But because of growing evidence that face masks provide some protection against the virus, they ask people to use face coverings (such as home made masks) instead.
It’s very difficult to evaluate the effectiveness of home made masks, because there is no quality control over them. Different fabrics, thicknesses, filters, sizes will produce different results. However, it is almost certain that home made masks are safer than no masks at all.
Now that the supply chain of PPE is getting back to normal, you may decide that you want to wear disposable masks if you think they are more secure than home made. Having used both disposables and reusables extensively, I find disposable masks more comfortable because they are much lighter than cotton ones. But I know lots of people who prefer to use reusable ones.
You do not need to change a disposable mask every half hour. Even in very high heat (and Hong Kong is extremely hot), the mask will draw humidity away and will be good for a day. At most you may need two a day, in most circumstances.
You don’t need to wear a mask if you are outdoors and away from people. In Hong Kong, it’s impossible to social distance in most settings, because of the density of population - there are people everywhere - therefore everyone wears a mask, all the time, except on hiking trails.
HTH