Monitoring site selected » Margam - Dyffryn School

Margam - Fire Station (Industrial)
Dwr Cymru Pumping Station (Industrial)
Twll-yn-y-Wal Park (Industrial)
Margam - Dyffryn School (Industrial)

Map of Neath Port Talbot

Kerbside Urban Background
Kerbside/Roadside Urban Background
Suburban Industrial
Suburban/Rural Industrial
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Neath Port Talbot AQMA

Explanation of Particulate Differences
Particulate pollution is unlike other pollutants as it can't be defined as a single gas or chemical. It is made up of a constantly varying mixture of small particles from many different sources, each with very different properties. The particles can vary in size, shape, number, toxicity and chemical composition. This makes the task of monitoring concentrations very difficult.
A number of very different monitoring methods have been developed, each with it's own advantages and disadvantages. As each method is so different, data from each method of particulate monitoring is not directly comparable. Where ever possible, we have indicated which type of analyser is used at each site. Great care should be taken when comparing results from different methods.
The most widespread and long-standing method of monitoring particulate pollution is by 'Tapered Element Oscillating Microbalance'(TEOM). The Government set their Air Pollution Index and Banding values (the 1 to 10 scale and the 'low', 'moderate', 'high' and 'very high' bands) with reference to this method. Particulate data gathered using other methods ('BAM' or 'APM') cannot be used in these calculations.
The European Union has adopted another method - the 'Gravimetric' method - as its standard. The UK Government advises a basic conversion factor of 1.3 to convert results from TEOM analysers to this European 'reference' method and a factor of 0.83 to convert results from BAM analysers. Therefore, all PM10 particulate results from TEOM analysers are multiplied by 1.3, all BAM analysers by 0.83 when making Air Quality Objective calculations
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