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SOUTH AFRICAN AND
WORLD HEALTH ORGANISATION
AMBIENT AIR QUALITY GUIDELINES

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Pollutant

Symbol

Guideline (SA)

Guideline (WHO)
Oxides of nitrogen NOx

0.200 ppm

  
Nitrogen dioxide NO2

0.05 ppm

150 ug/m3
Nitric oxide NO

0.150 ppm

  
Ozone O3

0.010 ppm

  
Sulphur dioxide SO2

0.030ppm

  
Non-methane hydrocarbons Non-CH4 HC

0.060 ppm

  
Lead Pb

1 ug/m3

1 ug/m3
Smoke  

100 um/m3

  
Total suspended particles TSP  

150 ug/m3
 

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Last updated: September 30, 1999.
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