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Regulation 16(3)(a) Regulation 19(6) Regulation 20(4)
| Reference method | |
|---|---|
| Sampling and analysis of benzene | A pumped sampling method on a sorbent cartridge followed by gas chromatographic determination |
| Analysis of carbon monoxide | A non-dispersive infra-red spectrometric (NDIR) method |
| Sampling of lead | The same reference method as for PM10 |
| Analysis of lead | ISO 9855: 1993 Ambient air — Determination of the particulate lead content of aerosols collected in filters. Atomic absorption spectroscopy method |
| Analysis of nitrogen dioxide and oxides of nitrogen | ISO 7996: 1985 Ambient air — determination of the mass concentrations of nitrogen oxides — chemiluminescence method |
| Sampling and measurement of PM10 | The reference method for the sampling and measurement of PM10 is that described in EN 12341 “Air Quality — Field Test Procedure to Demonstrate Reference Equivalence of Sampling Methods for the PM10 fraction of particulate matter” . The measurement principle is based on the collection on a filter of the PM10 fraction of ambient particulate matter and the gravimetric mass determination |
| Analysis of sulphur dioxide | ISO/FDIS 10498 (Standard in draft) Ambient air — determination of sulphur dioxide — ultraviolet fluorescence method |
| Reference method | |
|---|---|
| Sampling and analysis of Group B pollutants other than benzo(a)pyrene in ambient air | A method based on manual PM10 sampling equivalent to EN 12341, followed by digestion of the samples and analysis by Atomic Absorption Spectrometry or ICP Mass Spectrometry |
| Benzo(a)pyrene concentrations in ambient air | A method based on manual PM10 sampling equivalent to EN 12341 |
| Reference method | |
|---|---|
| Analysis of ozone | UV photometric method (ISO FDIS 13964 or equivalent) |
| Calibration of ozone instruments | The Reference UV photometer method (ISO FDIS 13964, VDI 2468, B1.6 or equivalent) |
| Reference method | |
|---|---|
| Sampling and analysis of polycyclic aromatic hydrocarbons in ambient air | A method based on manual PM10 sampling equivalent to EN 12341 |
| Sampling and analysis of mercury in ambient air | An automated method based on Atomic Absorption Spectrometry or Atomic Fluorescence Spectrometry |
| Sampling and analysis of the deposition of Group B pollutants, mercury, and polycyclic aromatic hydrocarbons | A method based on the exposition of cylindrical deposit gauges with standardised dimensions |
Regulation 18
1. The main objectives of measurements of ozone precursor substances are to analyse any trend in ozone precursors, to check the efficiency of emission reduction strategies, to check the consistency of emission inventories and to help attribute emission sources to pollution concentration.
2. An additional aim is to support the understanding of ozone formation and precursor dispersion processes, as well as the application of photochemical models.
3. Measurements of ozone precursor substances must include at least nitrogen oxides, and appropriate volatile organic compounds. For the purposes of this Schedule, “volatile organic compounds” means all organic compounds from anthropogenic and biogenic sources, other than methane, that are capable of producing photochemical oxidants by reaction with nitrogen oxides in the presence of sunlight.
4. A list of volatile organic compounds recommended for measurement by Directive 2002/3/EC(14) is given in the table below—
| Ethane | 1-Butene | Isoprene | Ethyl benzene |
| Ethylene | trans-2-Butene | n-Hexane | m+p-Xylene |
| Acetylene | cis-2-Butene | i-Hexane | o-Xylene |
| Propane | 1.3-Butadiene | n-Heptane | 1,2,4-Trimeth. Benzene |
| Propene | n-Pentane | n-Octane | 1,2,3-Trimeth. Benzene |
| n-Butane | i-Pentane | i-Octane | 1,3,5-Trimeth. Benzene |
| i-Butane | 1-Pentene | Benzene | Formaldehyde |
| 2-Pentene | Toluene | Total non-methane hydrocarbons |
5. The reference method for the analysis of oxides of nitrogen is ISO 7996:1985, Ambient air — determination of the mass concentrations of nitrogen oxides — chemiluminescence method.
6. Measurements should be taken in particular in urban and suburban areas at any monitoring site considered appropriate with regard to the monitoring objectives in this Schedule.
A full reference for this Directive is given at regulation 2(2)(d). Back [14]
The Air Quality Standards (Wales) Regulations 2007