Air-Purifying Plants & Herbal Garden

Moving into an apartment in a vastly different climate from what my allergy-prone airways had been used to, plus an unexpected health issue that was discovered purely by chance, meant I had to take charge of the air I was breathing. What indoor plants would be beneficial was my question.
The climate is very different from the humid coastal air I've been used to. Much colder, on higher ground, and very misty at times. There is a problem with mould, but dehumidifiers do help.
I knew about the Spekboom's (Portulacaria afra) ability to remove carbon dioxide from the atmosphere. This was the very first plant I would put on my trolley at a local plant nursery; in fact, I bought two! This plant also has medicinal properties and is quite delicious in salads, has a tart flavour, and is rich in Vitamin C. Spekboom can also be applied topically to soothe all kinds of skin conditions.
I will naturally not be harvesting my indoor plants, though, there are a couple already well-established outside my small apartment!

Moving from a large home with every window looking out onto lush greenery, to a smaller apartment where some windows look out onto the apartment building with only low-growing plants has been quite a change. This is a section of my little garden, and I'm starting to fill the bare patches with herbs.