Chapter 7 - Air Indicator Guideline Averaging Method of Time Measurement General Land Use 3.7 μg/ m 3 12 hours AS 3580.13.1- 1993 2.9 μg/ m 3 24 hours AS 3580.13.2- 1991 1.7 μg/ m 3 7 days 0.84 μg/m 3 30 days 0.5 μg/ m 3 90 days Conservation Areas 0.1 μg/ m 3 90 days Hydrogen Sulphide 7 μg/ m 3 30 minutes AS 3580.8.1- 1990 Policy 1.3 Monitor and review ambient air quality indicators and standards during the life of this Plan. Ambient air quality is dependent on the distribution and scale of contaminant discharges, and regional climate. The above indicators are selected as appropriate for monitoring ambient air quality in the Wairau/Awatere. This is implementing a precautionary approach to management of discharges to air. Monitoring ambient air quality entails measurement of long-term trends rather than short-term events. This Plan will undertake air quality monitoring to enable development of an ambient air quality management strategy in the next Plan. Information on ambient air quality allows the Council to: • Identify and prioritise air quality issues; • Justify control over discharges to air; • Assess policies for management of air quality; • Assess effectiveness of discharge control measures; and • Monitor long-term trends in air quality. It is necessary to set appropriate air quality indicators and standards for assessment purposes. These will give an indication of the effect that discharges to air have on the receiving environment. 7.4 Methods of Implementation Monitoring Establish objectives and monitoring criteria based on a region wide assessment of monitoring needs that meet the requirements of local and national interests. Develop an air quality monitoring strategy and establish a monitoring network. Set regular review periods to assess the effectiveness of the program and define other monitoring requirements. Maintain an emission inventory during the life of this Plan. 7 - 3