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Additional Information |
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This is additional information not included in the printed 2008 Annual Report. |
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| Ambient air quality monitoring |
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Eskom has operated an ambient air quality monitoring network since the 1980s to provide national and regional information on long-term trends in air quality. The network includes monitoring sites in the immediate vicinity of certain power stations and research sites. Additional monitoring stations have been installed near proposed new power stations and relocated to more appropriate locations.
The network measures not only Eskom emissions, but all emissions from surrounding sources. Monitoring equipment is calibrated against National Meteorological Laboratory standards in a laboratory accredited by the South African National Accreditation System. All sites, except two, are equipped to monitor SO2, NOx, ozone (O3), fine particulate matter (FPM), wind speed, wind direction and ambient temperature. The other two sites monitor SO2, FPM and meteorological parameters.
Map of air quality monitoring sites |
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The Palmer site was closed in 2004 after ten years of monitoring.
The Makalu site was closed in April 2005 after 21 years of continuous monitoring.
The Camden site was commissioned on 26 June 2003
The Grootstryd site was closed in August 2006 and relocated to Marapong.
The Kendal B site was closed in July 2007 and relocated to Phola township in August 2007.
The following air quality stations were commissioned during 2006:
- Marapong (Matimba)
- Kendal B (old Wilge power station)
- Komati
- Grootdraai (Grootdraai dam)
- Grootvlei
Annual mean of oxides of nitrogen (NOx) |
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The DEAT guidelines were not exceeded at any of the monitoring sites.
The National Environmental Management: Air Quality Act, 39 of 2004, Schedule 2 - Ambient Air Quality Standards sets an annual average of 200 parts per billion (ppb).
Annual Mean Fine Particulate Emissions (PM-10) |
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The DEAT annual guideline value of 60ug/m3 was exceeded at Leandra, but it should be noted that the data capture was low, and this may not be a true reflection of the annual mean.
The DEAT daily mean guideline value of 180ug/m3 was exceeded at Camden on one occasion.
The National Environmental Management: Air Quality Act, 39 of 2004, Schedule 2 - Ambient Air Quality Standards sets an annual average of 60 micrograms per cubic meter (ug/m3).
We were unable to calculate annual mean PM10 at Verkykkop as two different types of monitoring are in use and there was not sufficient data from either to allow calculation.
The figures for 2004/05 are not representative due to reduced data capturing at the Kendal site.
Annual mean sulphur dioxide (SO2) |
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The network measures not only Eskom emissions but all emissions from surrounding sources.
The DEAT annual guideline value of 19ppb was not exceeded at any of the monitoring stations. The DEAT daily mean guideline value of 48ppb was exceeded at Kendal on two occasions.
The DEAT hourly mean guideline value of 134ppb was exceeded at Kendal on 57 occasions, at Leandra on 14 occasions, at Verkykkop and Marapong on five occasions, and at Camden on three occasions.
The National Environmental Management: Air Quality Act, 39 of 2004, Schedule 2 - Ambient Air Quality Standards sets an annual average of 19 parts per billion (ppb). |
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