PO2 23 Air Pollution, City
Containing vehicle exhaust fumes, soot, pollens, moulds, dust of various types including from industries which may be situated many miles away, volcanic dust, etc.
PO2 24 Angora Wool
Wool from the angora rabbit.
PO2 25 Asbestos
Produced during building construction; in a study in New York of 3000 autopsies half had asbestos particles in their lungs.
PO2 26 Cladosporium Herbarum
One of the most common airborne moulds; common on windowsills and painted walls; most common mould outdoors; often involved in asthma; world wide distribution; spores are particularly prevalent in Europe in June.
PO2 27 Clay
Found in crockery, paper and board, as a coating on fertiliser pellets, in some rubbers (both synthetic and natural) and plastics, in household paint, crayons, pencils, toothpaste and cosmetics; also known as kaolin.
PO2 28 Fly Ash & Soot
Produced by incinerators, forest fires, fires in the home and garden; may travel many miles.
PO2 29 Guinea Pig Hair
PO2 30 Hemp, Italian
Some clothing and some traditional ropes.
PO2 31 Jute
Made from a plant grown in Asia; used as a backing for carpets, sacks for carrying food grain, fertilisers and cement.
PO2 32 Linen / Flax
Made from the flax plant; the by-products of linen production are processed into a pulp used for banknotes or fibreboard.
PO2 33 Methane
One of the greenhouse gases; main sources are coal mining, landfill, wetlands, poor management of manure, rice paddies and cattle.
PO2 34 Mohair Wool
Wool from the angora goat.
PO2 35 Moulds Various
Alternaria alternata, aspergillus niger, aspergillusfumigatus., fusarium sap., merulius lacrimans, mucor mucedo, penicillin, rhizopus nigricans, sporobolomyces, tricophytum rubrum, ustilago,cladosporium herbarum.
PO2 36 Newsprint
PO2 37 Ozone
Vehicles and industries are the major source of ground-level ozone gas emissions; also produced by photocopiers, etc. Occurs naturally in the upper layers of the atmosphere and shields the earth from the harmful ultraviolet rays of the sun.
PO2 38 Pollens & Grasses Various 1
Includes alder, beech, silver birch, elm, hazel, plane, poplar, willow, broom, cocksfoot, dog's tail, false oat, meadow foxtail, rye, timothy, sweet vernal, ragweed, mugwort, rape, heather, fat hen, plantain, buttercup, nettle, etc.
PO2 39 Pollens Grass, Trees & Flowers 2
Bent, meadow foxtail, sweet vernal grass, false oat, meadow brome, crested dog's tail, cocksfoot, meadow fescue, common velvet grass, perennial rye grass, timothy grass, annual meadow grass, alder silver birch, hazel, beech, ash, London plane, aspen, oak, white willow, short ragweed, mugwort, rapeseed, heather, fat hen, plantain, buttercup and nettle.
PO2 40 Pollens Various 3
Lily, amarylis, dwarf sunflower, ragweed, saltbush, chrysanthemum, corn, dahlia, ash, hibiscus, tiger lily, tulip tree, apple, tobacco, rose, African violet, willow, dandelion, pine, cherry, snap dragon, cat tail.
PO2 41 Printer & Photocopying Toner
A mixture of plastic particles (e.g. Styrene acrylate copolymer and polypropylene), iron and pigments, such as carbon black, and paraffin wax.
PO2 42 Quartz Sand
From mining operations, sandblasting, industrial grinding, and deserts and sand dunes, etc.
PO2 43 Ragweed, Giant & Short/Normal
One of the main hay fever pollens in the USA from mid August to November, peaking in September; these two varieties of ragweed cause the most problems; also found in the Rhône valley in France and some areas of Eastern Europe.
PO2 44 Ramie
Made from Chinese grass or rhea, a plant with fibrous leaves; used mainly with other fibres as a blend in fabrics resembling linen.
PO2 45 Rapeseed Pollen / Canola Pollen
A problem for many people particularly in the UK; known as canola in North America.
PO2 46 Rayon, Acetate
A fabric made from cellulose acetate fibres; resistant to staining and creasing.
PO2 47 Rayon, Viscose
A fabric manufactured by treating cellulose with carbon disulfide, caustic soda, and sulphuric acid; used in clothing, furnishing and carpets; the most important of the rayons.
PO2 48 Rust, Iron
The common name for an oxide of iron; occurs when iron is exposed to water and air; a lot of water supplies are contaminated by it, especially when main pipes are being repaired.
PO2 49 Sulphuric Acid / Sulfuric Acid
Produced by burning fuels and volcanoes; one of the components of acid rain; used in include fertiliser manufacturing, ore processing, chemical synthesis, waste water processing and oil refining.
PO2 50 Volcanic Dust
From two volcanoes: Halemaumau in Hawaii and Mt. St Helens; may travel thousands of mile.
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