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...health and plant growth. Unfortunately, gains made in reducing vehicle emissions of the key ozone 'precursors' (by fitting catalytic converters) are being outweighed by the worldwide growth in car usage. And there are many other anthropogenic sources of these pollutants as well - including power stations, industrial processes, and the burning of vegetation. SAQ 18 How...

...health problems (the fibres are fine and brittle and break down into a fine dust that can be breathed in). Modern mineral and glass fibre wool are safer, though it is advisable to wear a face mask when using them in confined spaces. Plastic foams use oil-based chemicals and, being plastic, are inflammable and can produce toxic smoke when burning. Urea formaldehyde foams,...