The Carbon Dioxide Word Game
<![CDATA[By Robert Lyon Young adults in Canada today have grown up during a period when educational standards are significantly different from those of previous generations, and “environmental awareness”, was often included as a formal or informal part of the curriculum. Yet, misconceptions abound. I was reminded of this the other day when a young woman I met expressed concern about how carbon dioxide was harming air quality and people’s health. Even the government, after all, calls carbon dioxide “pollution”. In the interests of clarity, therefore, I thought I would offer some hard information that people might find good to have. In brief, carbon dioxide does not harm air quality.Carbon dioxide is a colourless, odourless, tasteless gas found naturally in the earth’s atmosphere. It is produced by natural sources like volcanoes, hot springs and geysers, people and animals (including fish), decay of organic materials, the combustion (i.e. burning) of fossil fuels, and as a by-product of some industrial processes like baking and brewing. Plants and algae use light to photosynthesize a compound called carbohydrate from carbon dioxide and water. Carbon dioxide is the primary source of carbon life; in other words, without carbon dioxide, there would be no life on earth. Carbon dioxide is an essential element in human respiration; people breathe out about 40,000ppm (parts per million) CO2 with every breath. The quality of the air we breathe is sometimes impaired by certain contaminants, and it helps to know what these are. The main ones are:
- Particulate matter: Particulates are tiny drops of liquid and sold particles, the size of dust or smaller, suspended in the air. They come mainly from agriculture, construction and dust from roads, although various industrial sources play a role. Along with ozone, it is a major component of smog and, at high levels, can harm human health. (Often referred to as PM2.5 or PM10 – meaning Particulate Matter smaller than 2.5 or 10 microns in size.)
- Nitrogen oxide: Nitrogen dioxide is a reddish-brown toxic gas with an irritating smell. Exposure to high levels of nitrogen dioxide can cause breathing problems and reduced lung function, and it is a component of acid rain.
- Ground-level ozone: Low-level ozone is a colourless gas that is formed through a chemical reaction of nitrogen oxides and volatile organic compounds in sunlight. The major sources of nitrogen oxides and volatile organic compounds are transportation, oil and natural gas production, electricity generation, home heating and even the burning of firewood. At high levels, ground-level ozone can cause breathing problems, lung damage, and asthma attacks in humans and damage to sensitive vegetation.
- Sulphur dioxide: Sulphur dioxide is a colourless and toxic gas that smells bad. It is caused both by natural sources and by human activity, the most important of which are smelting and refining, electricity generation, heating, and oil and gas production and other industries. Sulphur dioxide in high concentrations can contribute to breathing and heart problems, especially among infants and the elderly.
- Carbon monoxide: Unlike carbon dioxide, carbon monoxide is a highly toxic gas that is caused by the incomplete burning of oil, natural gas and coal. High levels of carbon monoxide can cause dizziness, unconsciousness, and even death.