At least it is Defra approved.
For you & yours to minimise particulate exposure you could avoid opening the doors: set a fire and let it burn out.
For the environment, burning fully seasoned wood reduces emissions.
No doubt!
(Only way I can think of not getting a lung clogging amount of particulates into the air of the room is t not open the fire box doors whilst dried wood logs are still burning).
At least it is Defra approved.
For you & yours to minimise particulate exposure you could avoid opening the doors: set a fire and let it burn out.
For the environment, burning fully seasoned wood reduces emissions.