HELP - Moved into a 1900s home and have been getting very sick, is this co2 level at 2500 reading concerning?
We’ve moved into a new home in London that’s quite old 2 weeks ago and have been getting awful sore throats, dizziness and coughs. I have had multiple deep dust cleans and taking medication for allergies which hasn’t helped (I’ve lived in dusty mouldy houses before and been fine!). This air quality monitor spikes whenever we have windows closed very very quickly (within minutes) and reached 2800. Currently the only solution seems to be windows open 24/7 but even then we still have some symptoms but the air quality monitor shows better readings. We thought it may be the chimney causing this? The fireplace is unused and boarded up in every room (with vents that have been painted) except the lounge where we still do have a fireplace that we don’t use. Please any advice would be really helpful!
EDIT: we are sure about the accuracy as our air purifier has similar readings and we tested the monitor where we lived before and readings were completely normal.
EDIT 2: I think the fact that we have moved 2 weeks ago and are getting ill and 2 quality monitors whether cheap or not ONLY shows concerning readings in this house is somewhat linked?