b) Notice No 515, published in Government Gazette No 34493, dated 5 August 2011: Proposed National Ambient Air Quality Standard for Particulate Matter of Aerodynamic Diameter Less Than 2,5 Micron Metres, published to request written representations or objections in terms of section 57(1)(a) of the National Environmental Management: Air Quality Act, 2004 (Act No 39 of 2004).