The EMEP programme consists on three main elements: (1) collection of emission data, (2) measurements of air and precipitation quality and (3) modelling of atmospheric transport and deposition of air [..]

1,3-butadiene, like benzene, is organic compound emitted into the atmosphere principally from fuel combustion of petrol and diesel vehicles. Unlike benzene, however, it is not a constituent of the fue [..]

Total atmospheric deposition of acidity is determined using both wet and dry deposition measurements. Wet deposition is the portion dissolved in cloud droplets and is deposited during rain or other fo [..]

When atmospheric pollutants such as sulphur dioxide and nitrogen oxides mix with water vapour in the air, they are converted to sulphuric and nitric acids. These acids make the rain acidic, hence the [..]

A numerical index for air pollution from 1 to 10 related to the air quality bands of "low", "moderate", "high" or "very high".

If a local authority finds any places where the objectives are not likely to be achieved, it must declare an Air Quality Management Area there. This area could be just one or two streets, or it could [..]

Objectives are policy targets generally expressed as a maximum ambient concentration to be achieved, either without exception or with a permitted number of exceedences, within a specified timescale.

Standards are the concentrations of pollutants in the atmosphere which can broadly be taken to achieve a certain level of environmental quality. The standards are based on assessment of the effects of [..]

The air occurring at a particular time and place outside of structures. Often used interchangeably with "outdoor air".

The BAM (Beta Attenuation Mass Monitor) measures particulate concentrations automatically. The mass density is measured using the technique of Beta attenuation. A small Beta source is coupled to a sen [..]