9.3.2 Properties and Effects of Atmospheric Pollutants

Carbon Monoxide

Carbon monoxide (CO) is a toxic gas that is produced during incomplete combustion of fossil fuels. It is colourless and odourless, making it difficult to detect without proper monitoring equipment. High levels of carbon monoxide can be lethal, as it binds to haemoglobin in the blood, reducing its ability to carry oxygen. Hence, it is important to ensure proper ventilation and to have carbon monoxide detectors in place in order to prevent accidents.

Sulfur Dioxide and Oxides of Nitrogen

Sulfur dioxide (SO₂) and oxides of nitrogen (NOx) are emitted primarily from the burning of fossil fuels, particularly in power plants and vehicles. These pollutants contribute to the formation of smog and can have severe effects on human health.

Both sulfur dioxide and nitrogen oxides can cause respiratory problems such as bronchitis and asthma when inhaled. They also contribute to the formation of acid rain, which can have detrimental effects on ecosystems, including damage to forests, lakes, and aquatic life.

Particulate Matter

Particulate matter refers to tiny solid or liquid particles suspended in the air, often emitted during the combustion of fuels and industrial processes. These particles can vary in size, ranging from large visible particles (e.g., soot) to fine particles that are inhalable.

Particulates can have both environmental and health impacts:

• Environmental effects include global dimming, where these particles reflect sunlight back into space, leading to a cooling effect on the Earth's surface.
• Health effects can include respiratory issues, such as coughing, wheezing, and reduced lung function, as well as cardiovascular problems.