Clean Air and Climate Solutions for ASEAN

The report Clean Air and Climate Solutions for ASEAN is a comprehensive, science‑based assessment that identifies 15 priority measures capable of drastically improving air quality, public health, and climate outcomes across the Association of Southeast Asian Nations (ASEAN). Using updated modelling from the GAINS (Greenhouse gas–Air Pollution Interactions and Synergies) model, the report quantifies current and future pollutant exposures, evaluates the impact of existing legislation, and projects the benefits of enhanced regional action. The report is meant to support policymakers seeking evidence-based guidance to reduce PM2.5, short‑lived climate pollutants (SLCPs), and greenhouse gases throughout the region.

1. Context and Urgency
ASEAN’s 660 million people are heavily exposed to hazardous levels of ambient PM2.5. As of 2015, over 85% of the population lived in areas exceeding the 2021 WHO guidelines (5 µg/m³); approximately 100 million were exposed to levels above the WHO Interim Target 1 (35 µg/m³). Without stronger interventions, this number could grow to 170 million by 2030 due to economic growth, urbanization, and energy demand.
Pollution sources vary across the region but include:

Power generation (especially coal)
Transport (road and shipping)
Industry (including MSMEs)
Waste burning
Agricultural residue burning
Residential cooking using solid fuels

ASEAN has made progress with cleaner energy access, emission standards, and improved waste management, but current policies are insufficient to meet health‑protective air‑quality levels by 2030.

2. The 15 Priority Solutions
Through scenario analysis and mitigation potential evaluation, the report identifies 15 measures with the largest benefits for reducing PM2.5 exposure and cutting SLCPs, including:
Key measures with large impacts:

Clean cooking (LPG, electricity, improved stoves)
Renewables and post‑combustion controls (FGD, ESP, fabric filters)
Industrial process standards & energy efficiency
Vehicle emission standards & electrification (Euro VI/6 equivalent)
Vehicle inspection & maintenance (I&M) to eliminate high emitters
International shipping controls (low‑sulfur fuels, SCR, DPFs)
Livestock and fertilizer management (reduce NH₃, improve nitrogen use efficiency)
Dietary shifts (lower meat protein consumption)
Agricultural residue burning prevention
Waste management (ending open burning, recycling, landfill controls)
Forest and peatland fire prevention
Coal, oil, and gas sector interventions (reduce methane and BC)
Rice paddy alternate wetting and drying (AWD)
Wastewater treatment with biogas recovery
HFC replacement and efficient cooling technologies (Kigali Amendment compliance)

Collectively, these measures can:

Cut PM2.5 exposure by 50–70% by 2030
Triple the number of people breathing “clean air”
—from ~80 million (2015) to 250+ million (2030)
Reduce SLCPs significantly:

Black Carbon: –70%
Methane: –39%
HFCs: –75%

Lower CO₂ emissions by 25% in 2030 relative to baseline

These interventions provide strong co‑benefits for SDG 3 (Health), SDG 11 (Cities), SDG 12 (Sustainable Consumption), and SDG 13 (Climate Action).

3. Modelling Approach: GAINS Framework
The modelling:

Uses updated emission factors, sectoral data (transport, waste, agriculture), and energy/economic projections (IEA 2018).
Considers local vs. transboundary contributions (Annex 3).
Produces population‑weighted exposure estimates at national and regional scales.
Highlights that existing legislation accounts for ~40% of potential reductions, implying large remaining opportunities.

Spatial modelling shows that transboundary pollution is significant for several countries—especially Lao PDR, Vietnam, Thailand, and Malaysia—justifying ASEAN‑level cooperation.

4. Sector-by-Sector Insights
Energy
Coal-fired power is a major source of PM and precursors. While some countries deploy ultra‑supercritical tech and FGD, others still operate with weak standards. Renewable energy expansion and stringent plant standards are essential.
Industry
Large industries and numerous MSMEs produce significant emissions. Barriers include:

Limited enforcement capacity
Insufficient capital for upgrades
Solutions include public disclosure programs (e.g., Indonesia’s PROPER) and integrated energy-efficiency schemes.

Transport
Key issues include:

Old vehicles
Inconsistent fuel quality
Rapid motorization
Solutions center on Euro VI adoption, EV acceleration, and strong I&M programs.

Shipping
ASEAN’s major ports face growing pollution from maritime activity. Solutions include fuel switching, scrubbers, and IMO energy‑efficiency frameworks.
Agriculture
Large impacts come from:

Open burning
NH₃ emissions
Alternatives include composting, mulching, manure management, and dietary shifts.

Waste
Open burning is prevalent due to inadequate waste collection and disposal systems. Solutions emphasize zero‑waste approaches, national strategies, and integrated waste management.

5. Governance, Financing, and Regional Cooperation
Progress depends on:

Multi-level governance (national–local coordination)
Cross‑sector integration (health, environment, transport, energy, agriculture)
Strong financing mechanisms:

Green bonds / Green Sukuk
Central bank–supported green lending
Fossil‑fuel subsidy reform

Regional cooperation frameworks (ASEAN Secretariat, AWGCC, Haze Agreement)

The report proposes establishing champion countries (Thailand, Philippines, Cambodia) to lead ASEAN-level coordinated implementation and knowledge-sharing.

🔥 Highlighted Keywords
PM2.5, SLCPs, black carbon, methane, HFCs, GAINS model, 15 solutions, open burning, transboundary haze, ASEAN, clean cooking, electrification, Euro VI, waste management, agricultural burning, forest fires, renewables, nitrogen use efficiency, peatland fires, energy efficiency, I&M programs, regional cooperation, SDGs, air quality guidelines, ambient PM exposure, population-weighted concentrations, policy harmonization.