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Joburg Air Quality Management and Climate Change
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Guidelines |
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These guidelines prescribe the allowable ambient concentrations of pollutants which
are not to be exceeded during a specified time period in a defined area. If the
air quality guidelines are exceeded, the ambient air quality is poor and the potential
for health effects is greatest. |
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The City of Johannesburg Ambient Air Quality Guidelines. Values are expressed in
µg/m3 and where appropriate ppb (the volume standardized at a temperature of 20
°C and a pressure of 101,3 kPa (after Scorgie et al, 2003): |
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Sulphur dioxide
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10 minute running average
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185
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500
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WHO
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1-hr
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130
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350
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EC, UK
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24-hr
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46
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125
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SA, WHO, EC, UK
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annual
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18.5
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50
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SA, WHO
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Nitrogen dioxide
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instantaneous peak
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500
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955
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Current SA
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1-hr
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104
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200
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WHO, EC, UK
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24-hr
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100
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191
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Current SA
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1-month
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80
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153
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Current SA
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annual
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21
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40
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WHO, EC, UK
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Nitrogen oxide
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instantaneous peak
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900
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1125
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Current SA
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1-hr
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600
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750
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Current SA
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24-hr
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300
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375
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Current SA
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1-month
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200
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250
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Current SA
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150
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188
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Current SA
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Oxides of nitrogen
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instantaneous peak
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1400
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2080
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Current SA
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1-hr
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800
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1132
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Current SA
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24-hr
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400
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566
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Current SA
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| 1-month
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300
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403
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Current SA
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| annual
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200
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284
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Current SA
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| PM10
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24-hr
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50
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EC
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annual
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40
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EC - phase 1
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Carbon monoxide
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1-hr
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25 800
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30 000
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WHO, EC
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| 8-hr running average calculated on 1-hourly averages
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8 600
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10 000
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WHO, EC
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| Lead
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quarterly-average
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1.5
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Current SA
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0.5
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WHO, EC, UK, Australia
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| Ozone
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instantaneous peak
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250
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500
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Current SA
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1-hr
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100
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200
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Health criteria
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| 8-hr running average calculated on 1-hourly averages
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60
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120
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EC target based on WHO
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| PM2.5
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24-hr
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25
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| annual average
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To be determined upon revision of AQMP
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| Benzene
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annual average
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10
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cancer risks (<1:1 million)
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