{"id":"F2007B01142","name":"National Environment Protection (Ambient Air Quality) Measure","slug":"national-environment-protection-ambient-air-quality-measure","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":67910,"registerId":"commonwealth-F2007B01142-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Table 1: Standards for Pollutants","sectionType":"schedule","heading":"Table 1: Standards for Pollutants","content":"## Table 1: Standards for Pollutants\n\n| Column 1Item | Column 2Pollutant | Column 3Averaging period | Column 4Maximum concentration standard |\n| ------------ | --------------------------------- | ------------------------ | -------------------------------------- |\n| 1 | Carbon monoxide | 8 hours | 9.0 ppm |\n| 2 | Nitrogen dioxide | 1 hour1 year | 0.08 ppm0.015 ppm |\n| 3 | Photochemical oxidants (as ozone) | 8 hours | 0.065 ppm |\n| 4 | Sulfur dioxide | 1 hour1 day | 0.10 ppm0.02 ppm |\n| 5 | Lead | 1 year | 0.50 µg/m3 |\n| 6 | Particles as PM10 | 1 day1 year | 50 µg/m325 µg/m3 |\n| 7 | Particles as PM2.5 | 1 day1 year | 25 µg/m38 µg/m3 |\n\n> Note There are no maximum allowable exceedances.","sortOrder":0},{"sectionNumber":"Table 1A: Standards for SO2 from 2025","sectionType":"schedule","heading":"Table 1A: Standards for SO2 from 2025","content":"## Table 1A: Standards for SO2 from 2025\n\n| Column 1Pollutant | Column 2Averaging period | Column 3Maximum concentration |\n| ----------------- | ------------------------ | ----------------------------- |\n| Sulfur dioxide | 1 hour | 0.075 ppm |","sortOrder":1},{"sectionNumber":"Table 2: Goal for Particles as PM2.5 fro","sectionType":"schedule","heading":"Table 2: Goal for Particles as PM2.5 from 2025","content":"## Table 2: Goal for Particles as PM2.5 from 2025\n\n| Column 1Pollutant | Column 2Averaging period | Column 3Maximum concentration |\n| ------------------ | ------------------------ | ----------------------------- |\n| Particles as PM2.5 | 1 day1 year | 20 µg/m37 µg/m3 |\n\nFor the purposes of this Measure the following definitions shall apply:\n\n(1) Lead sampling must be carried out for a period of 24 hours at least every sixth day.\n\n(2) Measurement of lead must be carried out on Total Suspended Particles (TSP) or its equivalent.\n\n(3) In Column 3 of table 1 and Column 2 of tables 1A and 2 of Schedule 2, the averaging periods are defined as follows:\n\n- 1 hour clock hour average\n- 8 hour rolling 8 hour average based on 1 hour averages\n- 1 day calendar day average\n- 1 year calendar year average\n\n(4) All averaging periods of 8 hours or less must be referenced by the end time of the averaging period. This determines the calendar day to which the averaging periods are assigned.\n\n(5) For the purposes of calculating and reporting 8 hour averages, the first rolling average in a calendar day ends at 1:00 am, and includes hours from the previous calendar day.\n\n(6) The concentrations in Column 4 of table 1 and Column 3 of table 2 of Schedule 2 are the arithmetic mean concentrations.\n\nSchedule 3 Australian Standards Methods for Pollutant Monitoring\n\n```html\n

Pollutant

Method title

Method number

Carbon monoxide

Determination of Carbon Monoxide-Direct Reading Instrumental Method

AS 3580.7.1-2011/Amdt 1-2012

Nitrogen dioxide

Determination of Oxides of Nitrogen-Chemiluminescence Method

AS 3580.5.1-2011

Photochemical oxidants (as ozone)

Determination of Ozone-Direct Reading Instrumental Method

AS 3580.6.1-2016

Sulfur dioxide

Determination of Sulfur Dioxide-Direct Reading Instrumental Method

AS 3580.4.1-2008 REC:2018

Lead

Determination of Suspended Particulate Matter – Particulate metals high or low volume sampler gravimetric collection – Inductively coupled plasma (ICP) spectrometric method

AS/NZS 3580.9.15:2014

Determination of Suspended Particulate Matter – Total suspended particulate matter (TSP) - High volume sampler gravimetric method

AS/NZS 3580.9.3:2015

Particles as PM10

Determination of Suspended Particulate Matter-PM10 High Volume Sampler with Size Selective Inlet-Gravimetric Method

AS/NZS 3580.9.6:2015

Determination of Suspended Particulate Matter- Dichotomous sampler (PM10, coarse PM and PM2.5) – Gravimetric method

AS/NZS 3580.9.7:2009

Determination of Suspended Particulate Matter-PM10 continuous direct mass method using tapered element oscillating microbalance analyser.

AS 3580.9.8-2008 REC:2018

Determination of Suspended Particulate Matter-PM10 Low Volume Sampler-Gravimetric Method

AS 3580.9.9:2017

Determination of Suspended Particulate Matter-PM10 beta attenuation monitors

Determination of suspended particulate matter – PM10 continuous direct mass method using a tapered element oscillating microbalance monitor incorporating a filter dynamic measurement system (FDMS) unit

AS/NZS 3580.9.11: 2016

AS/NZS 3580.9.16:2016

Particles as PM2.5

Determination of Suspended Particulate Matter-PM2.5 low volume sampler-Gravimetric Method

AS 3580.9.10:2017

Determination of Suspended Particulate Matter-PM2.5 beta attenuation monitors

AS/NZS 3580.9.12:2013

Determination of Suspended Particulate Matter-PM2.5 continuous direct mass method using a tapered element oscillating microbalance monitor

AS/NZS 3580.9.13:2013

Determination of Suspended Particulate Matter-PM2.5 high volume sampler with size selective inlet – Gravimetric Method

AS/NZS 3580.9.14:2013

\n```\n\n> Note The standards in this table can be obtained from Standards Australia Ltd (see https://www.standards.org.au/.)","sortOrder":2}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The legislation appears focused on its original purpose of setting ambient air quality standards and measurement methods. The inclusion of 2025 standards represents an update rather than scope creep."},"complexity_factors":["Multiple tables with cross-referenced columns requiring careful reading to match pollutants with their standards","Technical measurement definitions (e.g., 'rolling 8 hour average', 'arithmetic mean concentrations')","Future-dated provisions (2025 standards) creating temporal complexity","Extensive incorporation of external Australian Standards by reference (AS/NZS 3580 series)","Specific sampling protocols (e.g., lead must be sampled 24 hours every sixth day)","Multiple averaging periods for single pollutants (e.g., nitrogen dioxide has both 1-hour and 1-year standards)"],"plain_english_summary":"This legislation sets legally binding national air quality standards for outdoor (ambient) air across Australia. It establishes maximum allowable concentrations for seven key pollutants: carbon monoxide, nitrogen dioxide, ozone, sulfur dioxide, lead, and two sizes of airborne particles (PM10 and PM2.5). Each pollutant has specific limits based on how long someone is exposed—for example, carbon monoxide is measured over 8 hours, while lead is measured over a full year. The rules also specify exactly how these pollutants must be measured, referencing official Australian Standards methods. Some stricter standards kick in from 2025, particularly for sulfur dioxide and fine particles (PM2.5). State and territory governments use these standards to monitor air quality and take action when pollution levels get too high, protecting public health."},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"This version extends the instrument beyond a single set of ambient concentration limits by adding phased tightening and a separate ‘‘goal’’ for PM2.5 from 2025 (Table 1A and Table 2). That introduces future‑dated, stricter requirements and a non‑standard label (Table 2 is described as a ‘‘goal’’ rather than a standard), so the Measure’s scope now includes both immediate standards and scheduled future tightening/targets. It also consolidates explicit technical monitoring prescriptions (detailed sampling frequency for lead and precise rolling‑average assignment rules) and a comprehensive list of Australian Standards methods; together these changes broaden the Measure from a high‑level benchmark to a more detailed technical implementation instrument. As a result, the practical scope has grown: it now signals specific future regulatory outcomes and imposes concrete monitoring procedures that increase implementation obligations for monitoring agencies and regulated parties."},"complexity_factors":["Multiple pollutants with multiple averaging periods per pollutant (e.g. 1 hour and 1 year for NO2; 1 hour and 1 day for SO2; 1 day and 1 year for PM10 and PM2.5)","Phased/dated provisions (Table 1A and Table 2 apply from 2025) creating transitional interpretation needs","Averaging period rules with rolling averages and specific assignment rules (8‑hour rolling averages; first rolling average ends at 1:00 am and may include previous calendar day)","Specific sampling frequency requirement for lead (24‑hour samples at least every sixth day) rather than continuous monitoring","Reference to external technical documents (many AS / AS/NZS method numbers in Schedule 3) that implementers must obtain and apply","Ambiguous formulation in the tables as provided (cells listing two averaging periods and two limits in single cells), increasing interpretive effort","Explicit statement that concentrations are arithmetic means (affects data handling)","No stated allowable exceedances or enforcement regime in the text provided (interpretation and enforcement left to jurisdictions)"],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- Establishes national ambient air quality concentration limits (standards) for a set list of pollutants and specifies how those concentrations are to be measured and reported.\n- The pollutants covered and their concentration limits are set out in Table 1 (carbon monoxide, nitrogen dioxide, ozone as photochemical oxidants, sulfur dioxide, lead, PM10 and PM2.5). Some pollutants have two averaging periods (for example, 1 hour and 1 year for nitrogen dioxide) with a corresponding limit for each averaging period.\n- Adds a tighter 1‑hour sulfur dioxide standard that applies from 2025 (Table 1A) and a PM2.5 goal for 2025 with lower daily and annual targets (Table 2).\n- Specifies measurement rules and sampling frequency for particular pollutants (for example, lead must be sampled for 24 hours at least every sixth day and measured on Total Suspended Particles (TSP) or equivalent).\n- Defines averaging-period conventions: what “1 hour”, “8 hour”, “1 day” and “1 year” mean; requires 8‑hour averages to be referenced by the end time of the averaging period; states that the first rolling 8‑hour average each calendar day ends at 1:00 am and thus includes hours from the previous calendar day; and requires that concentrations are reported as arithmetic means.\n- Identifies the Australian Standards (method numbers) that are accepted for monitoring each pollutant (Schedule 3).\n- Notes that there are no explicitly stated allowable exceedances in the tables (the tables don’t give a permitted number of times a limit may be exceeded).\n\n**Who this affects**\n\n- State and territory environment agencies and regulators: they are the bodies that will implement monitoring, reporting and enforcement arrangements consistent with these standards and accepted methods.\n- Local and regional monitoring operators (government and third‑party laboratories): they must use the specified sampling schedules and measurement methods if jurisdictions adopt these standards as written.\n- Emitters of air pollution (industry, utilities, transport authorities, major point sources): these entities may face regulatory or commercial pressure to reduce emissions to meet the standards adopted and enforced by their jurisdiction.\n- Communities and public health stakeholders: measurement and limits determine the way air quality is reported and the basis on which policy and planning decisions are made.\n\n**Why it matters (official purpose and what that implies in practice)**\n\n- The source claims the purpose is to set consistent national ambient air quality benchmarks to protect health and inform policy. Mechanically, the Measure does that by: (a) setting concentration thresholds by pollutant and averaging period; (b) prescribing how concentrations are calculated and assigned to calendar days; and (c) standardising monitoring methodology by reference to Australian Standards (Schedule 3).\n\n**Costs, incentives and trade‑offs (practical implementation effects)**\n\n- Who pays: monitoring costs will fall largely on governments or contracted monitoring providers (equipment, operation, labs). Costs of emission reductions fall primarily on point‑source emitters and sectors where reduced emissions require technology changes, fuel switching or operational limits.\n- Who decides: the Measure sets technical limits and methods, but enforcement, penalties, implementation timetables and any transitional arrangements are matters for jurisdictions and regulators. The Measure itself does not set civil or criminal penalties or specify enforcement procedures.\n- Behaviour changes signalled: jurisdictions and regulated entities must plan for monitoring upgrades, increased reporting fidelity, and, where standards are adopted and enforced, emission‑control investments (e.g. cleaner fuels, abatement technologies, operational controls).\n- Implementation risks and administrative burdens: monitoring to meet the specified Australian Standards requires trained staff, capital equipment, and consistent sampling schedules (e.g. lead sampling every sixth day). The rolling 8‑hour averaging rules and assignment of averages to calendar days create technical reporting requirements that increase measurement complexity and data‑processing needs.\n- Opportunity costs: funds allocated to expanded monitoring and compliance programs are resources not available for other public priorities; industry capital directed to abatement is diverted from other investment.\n- Effects on competition and private choice: regulated firms facing new or stricter standards (notably the 2025 PM2.5 goal and SO2 standard) may incur higher compliance costs, potentially affecting smaller operators disproportionately unless regulators provide flexibility or phased approaches.\n- Enforcement discretion and uncertainty: because the Measure sets concentration limits and measurement rules but does not itself contain enforcement mechanisms, outcomes depend on how each jurisdiction chooses to implement, enforce, and interpret items that are not fully prescriptive (for example, the absence of an expressed allowable number of exceedances).\n\n**Concrete operational details to note (technical points likely to matter to implementers)**\n\n- Averaging definitions: 1 hour is a clock‑hour average; 8 hour is a rolling 8‑hour average based on hourly averages; 1 day and 1 year are calendar averages. All 8‑hour or shorter averaging periods are referenced by their end time.\n- First rolling 8‑hour average each calendar day ends at 1:00 am and includes hours from the previous calendar day—this affects which calendar day an 8‑hour exceedance is recorded against.\n- Lead monitoring must use TSP and be sampled for 24 hours at least every sixth day—this is a defined, recurring sampling schedule rather than continuous monitoring.\n- Accepted methods are specific AS / AS/NZS standards listed in Schedule 3 (e.g. AS 3580.7.1-2011 for carbon monoxide); implementers must obtain and follow those technical standards.\n\n**Source claims vs practical tradeoffs**\n\n- The Measure’s stated goal is national consistency and protection of public health. In practice, national consistency requires jurisdictions to adopt the Measure and to resource monitoring and enforcement. The Measure reduces ambiguity about how concentrations are calculated and which measurement methods are acceptable, but leaves enforcement, compliance pathways and any permissible exceedances to jurisdictional processes—this shifts the principal implementation cost and discretion to states and territories.\n\n(References within the instrument: pollutant concentration limits and averaging periods are in Table 1; the 2025 SO2 standard is in Table 1A; the PM2.5 2025 goal is in Table 2; sampling/averaging rules are the numbered definitions (1)–(6); measurement methods are in Schedule 3.)"},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/national-environment-protection-ambient-air-quality-measure","history":"/api/acts/national-environment-protection-ambient-air-quality-measure/history","analysis":"/api/acts/national-environment-protection-ambient-air-quality-measure/analysis","conflicts":"/api/acts/national-environment-protection-ambient-air-quality-measure/conflicts","importantCases":"/api/acts/national-environment-protection-ambient-air-quality-measure/important-cases","documents":"/api/acts/national-environment-protection-ambient-air-quality-measure/documents"}}