| A | B |
|---|
| Toxic wastes | poisonous pollutants |
| Arsenic, cyanide, chlorine, sulphuric acid are all | toxic |
| Other toxic wastes include | chloroform, mercury, ammonia, furans |
| Safeguards against radioactive materials | must be in force for thousands of years |
| Microscopic solid particles and fine mists | are known as particulates |
| Air Quality Index measures | degree of risk to health |
| Sulphur dioxide is a colourless | gas with a pungent odour |
| Carbon monoxide is a colourless | odourless, tasteless gas |
| Nitrogen dioxide is a | reddish-brown gas |
| Ozone is a pungent-smelling | faintly blue gas |
| Particulates are microscopic | solids that make the air hazy |
| Ozone is both | harmful and helpful |
| Ozone near ground level is formed | by the action of sunlight on air pollutants |
| The mean temperature on our planet is | 15 degrees Celsius |
| Pollutants contribute to the | greenhouse effect |
| Acid rain may fall many miles | from the original source of pollution |
| Acid rain is produced when sulphur | dioxide and nitrogen oxides react with water vapour |
| A chemical reaction dependent on light | photochemical reaction |
| A society that reduces environment impact | conserver society |
| It helps protect you from sunburn | ozone layer |
