Volume Two 23. Airport Zone environment not exceeding of 35dBA L Aeq at night time with the windows closed and must be certified by an acoustic engineer as adequate to achieve the design standard. 23.2.6. Use of external lighting. 23.2.6.1. All exterior lighting, other than navigational lighting, must be directed away from any adjacent property or road so as to avoid any adverse effects on the neighbourhood and on traffic safety. 23.2.6.2. Light spill onto an adjoining property within the zone, measured 2m inside the boundary of the property, must not exceed 10 Lux spill (horizontal and vertical). 23.2.7. Odour. 23.2.7.1. The odour must not be objectionable or offensive, as detected at or beyond the legal boundary of the area of land on which the permitted activity is occurring. 23.2.8. Smoke. 23.2.8.1. The smoke must not be objectionable or offensive, as detected at or beyond the legal boundary of the area of land on which the permitted activity is occurring. 23.2.9. Dust. 23.2.9.1. The best practicable method must be adopted to avoid dust beyond the legal boundary of the area of land on which the activity is occurring. 23.2.10. Dust from any process vent or stack. 23.2.10.1. The dust must not contain hazardous substances. 23.2.10.2. The particulate discharge rate from any air pollution control equipment and dust collection system must not exceed 250mg/m at any time, corrected to 0°C, 1 3 atmosphere pressure, dry gas basis. 23.2.10.3. Dust particles must not exceed 0.05mm size in any direction. 23.3. Standards that apply to specific permitted activities 23.3.1. Engine testing. 23.3.1.1. The noise levels from aircraft engine testing must comply with the following: (a) The testing must take place between 7am and 10pm and only essential unplanned engine testing can occur outside those hours; (b) noise generated by testing, measured at the notional boundary of a noise sensitive activity in the Rural Environment Zone, must not exceed 55dBA L Aeq ; (c) essential unplanned engine testing must take place on not more than 12 occasions per year for Woodbourne Airport and on not more than 6 occasions per year for Omaka and Picton (Koromiko) Airports; (d) noise from essential unplanned engine testing must not exceed the following noise levels at the notional boundary of any noise sensitive activity in the Rural Environment Zone: Any day 10.00 pm to 7.00 am 55dBA L Aeq 80dBA L AFmax 23 – 5