There's nothing quite like the scent of forest air - the real thing, not an air freshener :). The trees and plants of a forest are constantly circulating oxygen and carbon dioxide, unlike in the midst of a concrete jungle when the air we breathe can get somewhat stale or downright poisonous.
Our homes aren't an oasis from our toxic modern environment; in fact the inside of our houses can have very poor air quality due to fumes from cigarette smoke, furnishings, paint and other items. Some items can give off these fumes for many years - that smell of fresh paint and new carpets isn't harmful just while you can detect it.
The airborne chemical cocktail inside our home often includes:
benzene - used in oils, paints, plastic, rubber
trichloroethylene (TCE) - paints, lacquers, varnishes and adhesives
formaldehyde - foam, clothing, particle board, carpets.
All of the above have been shown to be potent environmental pollutants and likely carcinogens in humans.
Keeping indoor plants not only adds a nice green touch to our homes; some indoor plant species have proven to be effective filters for pollutants such as the above and carbon monoxide (an element of car exhaust).
I came across a couple of very interesting studies by NASA carried out in the late 80's and early 90's that included information on the plants NASA found useful as indoor air filters to combat these chemicals.
Beneficial plants include (scientific name followed by common) :
Aloe vera
Aglaonema Modestum - Chinese Evergreen
Chamaedorea Seifritzii - Bamboo Palm
Chlorophytum elatum - Green Spider Plant
Chrysanthemum morifolium - Pot Mum/Florists' Chrysanthemum
Dracaena Janet Craig - Janet Craig
Dracaena Marginata - Marginata
Dracaena Massangeana - Mass cane/Corn Plant
Dracaena Warneckii - Warneckii
Gerbera Jamesonii - Gerbera Daisy/African daisy
Hedera Helix - English Ivy/Common Ivy
Philodendron Domesticum - Elephant Ear Philodendron
Philodendron Oxycardium - Heart Leaf Philodendron
Philodendron Selloum - Lacy Tree Philodendron
Sansevieria Laurentii - Mother in law's tongue
Scindapsus aureus - Golden Pothos
Spathiphyllum Mauna Loa - Peace Lily/Mauna Loa
Some of the above are more effective than others at filtering particular chemicals, so if you'd like to learn more about the NASA research, here's the study:
Interior Landscape Plants For Indoor Air Pollution Abatement (PDF 1.7 megabytes)
Time I got down to the nursery and loaded my office with plants it seems; I'll need a jungle :).
