Appendix 3.1 : Hong Kong Air Quality Objectives (AQOs). This table consists of 5 columns.  The first column is 'Pollutant', the second column is 'Averaging Time (ii)', the third column is 'Concentration in mircograms per cubic metre (μg/m3) (i)', the fourth column is 'No. of exceedances allowed per calendar year', the fifth column is 'Health effects of pollutant at elevated ambient levels'. End of summary 

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  2005 Copyright Important notices  Last revision date : May 2014