|What We Monitor|
The weather conditions monitored at our continuous stations locations can include some or all of the following parameters:
Reactive hydrocarbons and oxides of nitrogen combine in the presence of sunlight to form ozone (O3), which is a bluish gas, whose pungent odour can be smelled only at very high concentrations. In the stratosphere ozone prevents most of the sun’s harmful UV-B radiation from reaching the earth’s surface, but at ground level, ozone is a major component of smog. Natural processes can also greatly influence ground-level ozone concentrations.
Hydrogen sulphide is a colourless gas with a rotten egg odour. Its presence in natural gas makes the gas "sour." Some sources of hydrogen sulphide include:
Nitrogen oxides are produced during the burning of natural gas, coal, oil and gasoline. Nitrogen oxides are commonly found at higher concentrations in urban locations because of vehicle exhaust emissions. However, they are also detectable in rural areas as a result of emissions from:
Particulate Matter (PM2.5)
Respirable particulates, or PM2.5, are particulate matter less than 2.5 micrometres in diameter. They are small enough to penetrate into the lungs. Respirable particulates originate in the atmosphere because of condensation and combustion from sources such as:
Sulphur dioxide is a colourless gas with an irritating odour and taste. Major sources of sulphur dioxide are: