In Baguio City, road transport accounts for 94 percent of criteria air pollutants and 24 percent of climate pollutants, according to Clean Air Asia data cited in PCIJ reporting. Jeepneys are the leading source of CO₂, while UV Express vans contribute the most particulate matter and black carbon. The city’s streets were designed for 20,000 vehicles — a threshold breached in 1988 — and today about 59,000 registered vehicles navigate roads originally built for a fraction of that load, with another 28,000 vehicles passing through daily. The result is air that, despite Baguio’s “Breathe Baguio” health-sanctuary campaign, regularly exceeds international safety guidelines.
These figures are not just numbers on a dashboard. For roughly 2,000 jeepney drivers in Baguio who spend 8 to 12 hours daily on the road, exhaust residue collects on their surgical masks by the end of a shift — visible proof of what they inhale as part of the job. Dr. John Wong, cited in PCIJ reporting, notes that occupational hazards should be addressed first through engineering controls, then administrative controls, with masks only as a temporary last resort. But reducing drivers’ hours is difficult when their earnings depend on every trip. The broader national picture is no better: vehicles are responsible for 74 percent of the Philippines’ air pollution, and a De La Salle University study estimates that replacing old models in Metro Manila could cut carbon monoxide and particulate matter emissions by 90 percent. Yet only 4 percent of the country’s 158,000 jeepneys have been replaced since the government’s modernization program began in 2017. That gap — between what clean air demands and what current policy delivers — is the thread running through this story.
These three dimensions — old engines, geography that compounds pollution, and enforcement that struggles to keep pace — do not operate in isolation. A jeepney that passes an inspection in the morning can emit black smoke by afternoon if its engine is worn and its load is heavy on a steep incline. The terrain that draws tourists to Baguio also makes its air worse: engines labour harder climbing the city’s roads, and the surrounding mountains trap what they emit. Understanding how each piece reinforces the others is where the real picture emerges.
What a Cleaner Engine Standard Actually Changes
A 2025 UP study modeled what would happen if jeepneys in Trece Martires City, Cavite, adopted Euro-4 engines. The projected reductions are significant: carbon monoxide would drop by 84.30 percent, PM₂.₅ by 83.36 percent, and nitrogen oxides by 21.76 percent. Only sulfur oxides would rise — by 14.14 percent — a trade-off that reflects the sulfur content in diesel fuel. These are not speculative future gains; Euro-4 technology already exists and is mandatory for new public utility vehicles under the government’s PUV modernization program. The problem is adoption. At current replacement rates — 4 percent over roughly seven years — full turnover would take decades.
The main obstacle is cost. A modern Euro-4 compliant jeepney or minibus costs at least ₱2.8 million, while the average driver earns about ₱650 a day. The government offers a subsidy of ₱160,000 per jeepney — less than 6 percent of the purchase price. The Land Transportation Office estimates that ₱64.2 billion is needed to raise the subsidy to ₱360,000 per vehicle; in the most recent budget, only ₱1.8 billion was allocated for subsidies and social safety programs. Drivers’ groups have requested at least ₱1 million per driver or, alternatively, government-supported retrofitting of existing jeepneys with cleaner engines, including Euro-6 standards.
The cooperative model offers one path forward. Some drivers who have joined cooperatives and switched to Euro-4 minibuses report earning a fixed daily wage of ₱750, with the cooperative managing loan repayments and taking the remainder of earnings. But this works best for operators on high-demand routes; for those serving less profitable lines or working independently, the numbers do not add up. And while the government’s end goal is a transition to zero-emission electric vehicles, the Philippines still lacks sufficient charging infrastructure, making electric jeepneys a distant prospect for most routes.
When Geography, Inspection Tricks, and Outdated Standards Collide
Baguio’s air pollution problem is not just about what comes out of tailpipes — it is about where that exhaust goes once it leaves the engine. The city sits in a topographic bowl, and during cooler months a thermal inversion layer traps cold air and pollutants near the ground. PM₂.₅ levels measured at Burnham Park between April 2025 and April 2026 averaged 14.41 μg/m³ — within the Philippines’ “good” AQI classification but roughly three times the WHO annual guideline. Outside of holiday peaks, PM₂.₅ neared or crossed unhealthy levels during periods tied to tourism surges, including the final two weeks of 2025 when about 118,000 visitors arrived. Measured against the WHO 24-hour guideline of 15 μg/m³, Baguio exceeded it two out of every five days over that monitoring period.
Enforcement faces its own set of complications. Some drivers in Baguio clean their exhaust pipes before emissions inspections to reduce visible soot — a workaround that lets a vehicle pass in the morning while emitting above legal limits the rest of the day. In Davao City, a study published in the International Journal of Research and Innovation in Social Science found that of 905 vehicles tested by the Anti-Smoke Belching Unit, 526 failed and received citation tickets, while 164 drivers were specifically caught violating the Clean Air Act for smoke belching. The study’s participants identified lack of awareness among drivers, insufficient promotion of the law, and minimal fines as reasons the Clean Air Act falls short in practice. One participant is quoted describing the law as effective only “depending on enforcement rigor.”
The gap between Philippine and international standards further complicates the picture. The Philippine AQI classifies PM₂.₅ at or below 25 μg/m³ as “good.” The WHO annual guideline is 5 μg/m³ — five times stricter. Greenpeace Philippines has stated that the country’s standards are outdated and that air pollution remains unchecked due to inadequate monitoring. Smart poles installed in Baguio track overall air quality indices but do not measure precise PM₂.₅ concentrations, meaning the data available to officials and the public is coarser than what health researchers rely on.
→ Philippine vs. WHO air quality thresholds
| Metric | Philippine “Good” Standard | WHO Guideline |
|---|---|---|
| Annual PM₂.₅ limit | 25 μg/m³ | 5 μg/m³ |
| 24-hour PM₂.₅ limit | Not specified in “good” range | 15 μg/m³ |
| Baguio average (1998–2023) | 25.15 μg/m³ (borderline) | 5.03× the guideline |
| Baguio Burnham Park (Apr 2025–Apr 2026) | 14.41 μg/m³ (within “good”) | 2.88× the guideline |
What Drivers, Policymakers, and Commuters Can Actually Do
The modernization program has stalled not because the technology is unproven but because the economics do not work for the people asked to pay for it. Different stakeholders have different levers — and the research points to concrete moves each group can take now.
For Drivers and Operators: Cooperatives, Retrofitting, and Route Planning
Joining or forming a cooperative remains the most viable path to accessing loans and subsidies. The Land Bank of the Philippines has provided financing to some cooperatives — one group in Metro Manila managed to fund a fleet of 52 modern jeepneys through state bank loans. Drivers who cannot yet afford a full replacement can advocate for retrofitting with Euro-4 or Euro-6 engines, which the UP study confirms would deliver most of the same air quality benefits at a fraction of the replacement cost. Route planning also matters: drivers on steep, congested routes where engines work hardest and emissions spike may gain more from rerouting schemes than from vehicle upgrades alone. Baguio’s traffic rerouting program aims to reduce the strain on engines climbing steep roads, though terrain limits its effectiveness.
For Local and National Government: Link Enforcement to Real Standards
Baguio’s city government has taken several steps — emissions inspections, zoning enforcement, pedestrian-priority streets, satellite parks, and a planned integrated transport terminal in partnership with Megawide Construction Corporation. But enforcement loses teeth when the standard being enforced is five times looser than what health research says is safe. Updating the national AQI classification to align more closely with WHO guidelines, as Greenpeace has urged, would immediately tighten the bar that inspections measure against. The ₱64.2 billion needed to raise jeepney subsidies to ₱360,000 per vehicle is a significant sum, but Dr. Antonio La Vina, cited in Straits Times reporting, has suggested that officials seek financing from developed countries to advance a just green transition — framing cleaner transport as a global climate obligation, not just a domestic cost.
For Commuters and Residents: Awareness and Public Pressure
Individual action has limits when the problem is structural, but commuters can shift demand by choosing routes served by cleaner vehicles where available, reporting persistent smoke-belching vehicles to local enforcement units, and supporting policy proposals that tie modernization to health outcomes rather than just fleet turnover. Baguio’s experience shows that tourism revenue and clean air do not have to conflict — but managing the balance requires real-time monitoring that produces actionable data, not just a “good” sticker on a dashboard.
The most direct step any reader can take is to verify the air quality standards their city uses. If the local AQI calls “good” what WHO calls unhealthy, the problem is not the air — it is the ruler used to measure it.
Frequently Asked Questions
How much does a modern jeepney cost vs. what drivers earn? ▾
What subsidy does the government currently offer for jeepney replacement? ▾
What is Republic Act 8749 and why is it relevant? ▾
How does Baguio’s geography make its air pollution worse? ▾
Can old jeepneys be retrofitted instead of replaced? ▾
How many jobs are at risk from the modernization program? ▾
The path forward on jeepney emissions is not a single fix — it is a series of realignments: tightening the standards we measure against, closing the gap between inspection results and real-world emissions, and distributing the cost of cleaner technology away from drivers who earn ₱650 a day. Every city has its own version of this equation, but the variable that matters most is whether the rules being enforced are actually protective enough to begin with.
If this was useful, you might also want to read how deforestation and pollution compound each other across Philippine ecosystems.
Sources
Philippines air pollution worsens — Trends in national air quality data and why the problem is accelerating.
Philippines environmental laws on pollution — A broader look at the regulatory framework beyond the Clean Air Act.
Baguio jeepney drivers are paying the cost of bad air. PCIJ, 2026.
In Baguio, the air that draws crowds isn’t as clean as it seems. PCIJ, 2026.
Beyond the hazy skyline: commuter perspectives on R.A. 8749 in Davao City. IJRISS, 2025.
Switching jeepneys to Euro-4 engines can significantly reduce air pollution. UP OVPAA, 2025.
Manila’s colourful jeepneys make way for carbon-free minibuses. Straits Times, 2025.
