All this information, and more besides, can be made available to them by the landlord upon entering the property agreement.The towel was used as an example. Most, if not all tenants prefer to ignore the need for ventilation. I've seen opening windows taped up to stop air movement, trickle vents not just closed but sealed up. Most people use radiators as a means of drying clothes (Oh for heated airing cupboards in houses - how many have disappeared with modern boilers). How many people realise that paraffin heaters produce water vapour along with CO2 as a product of combustion; Also the Calor 'Heat Cabinets' (mobile gas heaters) - they produce at least 1.5kg of water vapour for every 1kg of gas burnt (This link is in imperial measurements unfortunately).
Really the only solution to these problems is forced, heat exchanging, permanently running ventilation. Permanently running means that the tenants cannot turn the ventilation fan off.
Wriggle all you like, but the landlord is clearly at fault in this matter, and Swarbrick should resign from RBH.