Hard floors
No curtains (I have blackout blinds)
Change bedding, I prefer outside drying to tumbling but at this time of year tumble and shake out well before remaking.
Hoover mattress (tool for edges and button indents, main hoover head for rest of mattress). Once a few hoovers have been done this can be done less frequently.
Mattress protectors (more than one if you have spares) wash in with the bedding wash.
Pillow protectors on new anti allegy pillows, wash these too.
Open windows daily (I do mornings while everyone else is out).
Leave beds open all the time to air, don't neatly fold the duvet either flop it over the foot plate of the bed.
I've bought duvet protectors for my duvet which zips up.
Everything gets washed in non-bio washing powder.
I keep on top of my dusting these days, heavy dust gets hoovered up, light dusting every other day I use a feather duster and shake off out of windows (my neighbours must think I'm bonkers), find the feather dusting quick and effective.
I suffer reactions to pollen and dust (amongst other triggers) have flare ups but I'm much better than I used to be.