First thing that came to mind...if I may...
the air...and the old furniture with all it's
energy from others it carries.
(Not bad energy...just like unnecessary cloudiness lingering all
over the room.)
Get Selenite in that work area! Clear the environment daily.
As far as toxins...I'm big on Flower Essences from an experienced
practitioner...but do something more
to cleanse what you are breathing in.
Hope this helps you.
(I used to restore furniture.)