Development of Australian secondary ambient air quality criteria for sulphur dioxide and nitrogen oxides
Murray, F., Clarke, K., Wilson, S. and Monk, R. (1991) Development of Australian secondary ambient air quality criteria for sulphur dioxide and nitrogen oxides. School of Biological and Environmental Sciences, Murdoch University, Murdoch, Western Australia.
Dose-response relations for the effects of S02 and NOx (NO and N02) on Australian vegetation were developed using open-top chamber fumigation. This information was used, in conjunction with review of the literature, to formulate secondary ambient air quality criteria for the protection of human welfare in Australia.
A simple linear regression of S02 concentration versus response best described the effects of long term, frequent exposures to S02 on the growth or yield of Australian vegetation. This regression predicted zero yield or growth loss at 25 nLL -1 S02 as a 4-h average. Exposure length and frequency were of little importance in determination of the dose-response relationship. Leguminous species and Eucalyptus species showed a no-threshold response due to simultaneous exposure to S02 and NOx. Both NO and N02 were phytotoxic.
To protect human welfare in Australia it is recommended that a one hour arithmetic mean value of 200 nLL -1 S02 not be exceeded, a four hour arithmetic mean value of 25 nLL-1 S02 not be exceeded more than once per week and that the sum of the NO and N02 concentrations be no higher than 25 nLL-1 as a four hour arithmetic mean in the presence of the same levels of S02.
|Murdoch Affiliation:||School of Biological and Environmental Sciences|
|Publisher:||School of Biological and Environmental Sciences, Murdoch University|
|Notes:||Final report to the Energy Research and Development Corporation, February 1991|
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