Thanks. It's probably worth getting checked, because as you say it may help me understand how to manage things better. Fortunately it's rare that I'm in a loc

Thanks. It's probably worth getting checked, because as you say it may help me understand how to manage things better. Fortunately it's rare that I'm in a location that's so bad for me that I can't handle it. The low-speed air purifier (fan) solution is usually good enough when necessary.