Air quality monitoring in the Philippines has long been hampered by the high cost of imported equipment, leaving many local governments and communities without reliable data on what they are breathing. The University of the Philippines has developed a low-cost air quality monitoring system designed to change that, deploying 36 sensors across the country in partnership with local government units. For residents in participating cities, this means that decisions like school suspensions can now be based on actual air quality readings rather than guesswork.
This initiative, led by the UP Center for Air Research in Urban Environments (UP CARE), represents a shift toward democratizing air quality data. Instead of relying solely on a handful of expensive monitoring stations, the program uses affordable sensors and software applications that researchers, regulators, local governments, and the general public can actually use. The data from these sensors has already informed real policy decisions — Quezon City, for instance, used sensor readings as the basis for suspending classes when air quality reached unhealthy levels, according to Vanessa Claire Vinarao, acting chief of the city’s climate change mitigation division. For a deeper look at how pollution levels in the capital compare to health standards, see our analysis of Manila air quality exceeding safe thresholds.
What the UP CARE System Actually Does
The core idea behind UP CARE is straightforward: make air quality visible and accessible. Dr. Julius Rhoan Lustro, who leads Project Four of the program, explained at a roundtable discussion that the goal is to use low-cost engineering simulation tools to identify how pollutants move around in enclosed spaces. This matters because most Filipinos spend a significant portion of their day indoors — at home, in schools, or in workplaces — yet indoor air quality is rarely monitored. The program’s approach fills that gap by providing affordable technology that can be deployed in both indoor and outdoor settings.
Dr. Richard Hizon, the program leader, noted that the high cost of commercially available air quality monitoring technologies prompted the development of UP CARE’s own systems. Rather than importing expensive equipment that few local governments could afford, his team built customized sensors that cost a fraction of the price. The 36 sensors already installed across the country, in partnership with various LGUs, represent a growing network that could eventually provide a more complete picture of air quality in urban and industrial areas. This aligns with broader efforts by the Environmental Management Bureau (EMB), which is currently updating its guidelines and policies concerning air quality, as EMB engineer Chadbert Nikko Aquino confirmed during the same roundtable discussion.
How Air Quality Data Is Already Changing Local Policy
The practical impact of this monitoring network is already visible in Quezon City. Vanessa Claire Vinarao, acting chief of the city’s Climate Change and Environmental Sustainability Department, shared that data from UP CARE sensors has directly shaped local policies — including decisions on school suspensions based on air quality levels. This represents a concrete example of science-based policymaking at the local level, where officials no longer have to rely on anecdotal evidence or delayed reports from distant monitoring stations.
The implications extend beyond school closures. For local governments, having access to reliable, real-time air quality data means they can identify pollution hotspots, track trends over time, and evaluate the effectiveness of interventions. For residents, it means transparency — knowing what is in the air they breathe and holding authorities accountable when levels become hazardous. The UP CARE program’s alignment with the EMB’s ongoing policy updates suggests that this data could eventually feed into national air quality standards and enforcement mechanisms. For context on how pollution affects public health more broadly, our article on pollution’s impact on public health in the Philippines explores the wider consequences.
What Gets Overlooked in the Push for Better Monitoring
While the expansion of low-cost sensors is promising, several nuances complicate the picture. Understanding these helps clarify what the technology can and cannot do.
The Gap Between Data and Enforcement
Having more data does not automatically lead to cleaner air. The UP CARE system provides information, but acting on that information requires political will, funding, and enforcement capacity at the local level. A sensor may show that particulate matter levels are dangerous, but if a local government lacks the resources or authority to regulate the sources of that pollution — whether industrial emissions, vehicle exhaust, or open burning — the data alone changes little. The EMB’s ongoing work on updating guidelines and policies is a step in the right direction, but implementation remains uneven across the country.
Indoor Air Quality Remains Underaddressed
Most air quality discussions focus on outdoor pollution, yet Filipinos spend the majority of their time indoors. Dr. Lustro’s team is working on simulation tools for enclosed spaces, but indoor air quality monitoring is still in its early stages compared to outdoor networks. The Department of Labor and Employment’s Occupational Safety and Health Center (DOLE-OSHC) has emphasized the importance of good indoor air quality for worker health and productivity, as Engr. Raymar Fernando noted during the roundtable discussion. However, widespread indoor monitoring — in schools, offices, and homes — remains a gap that the current sensor network has only begun to address.
Sensor Accuracy and Calibration Challenges
Low-cost sensors are not as precise as reference-grade monitoring equipment. They can detect trends and relative changes in air quality, but their absolute readings may vary depending on environmental conditions, calibration frequency, and sensor drift over time. This means that while the data is useful for identifying pollution patterns and triggering public health responses like class suspensions, it may not meet the rigorous standards required for legal enforcement or regulatory compliance. The UP CARE team acknowledges this limitation and continues to refine their technology, but users of the data — from LGUs to researchers — need to understand what the sensors can and cannot reliably measure.
The Need for Interdisciplinary Collaboration
Dr. Mylene Cayetano of the UPD Institute of Environmental Science and Meteorology called for continued interdisciplinary collaboration among academic institutions, government, and the private sector. This is not just a technical challenge — it involves public health experts, urban planners, economists, and community organizers. Air quality improvement requires coordinated action across multiple domains, and no single sensor network can solve the problem alone. The UP CARE program provides a platform, but the broader ecosystem of stakeholders must work together to translate data into sustained policy change. For more on how pollution interacts with environmental systems, see our piece on pollution surges linked to carbon emissions.
What You Can Do With Air Quality Information
For individuals and local governments looking to make use of air quality data, several practical steps are worth considering.
Access Public Sensor Data
The UP CARE platform is designed to be accessible to the general public. Residents in areas where sensors are deployed can check real-time air quality readings through the program’s software applications. If your LGU is not yet part of the network, you can inquire with your local environment or climate change office about whether they are planning to partner with UP CARE. The program has already installed 36 sensors nationwide, and expansion depends partly on demand from local governments.
Advocate for Data-Driven Local Policies
Quezon City’s use of sensor data for class suspensions provides a template that other LGUs can follow. If your area has air quality monitoring in place, ask your local officials how they are using that data. Are there policies for school closures during high-pollution days? Are pollution sources being identified and addressed? The existence of data creates an opportunity for accountability — but only if citizens and local leaders push for its use in decision-making.
Understand Indoor Air Quality Risks
Since most people spend the majority of their time indoors, paying attention to indoor air quality is equally important. Simple measures like improving ventilation, using exhaust fans in kitchens and bathrooms, avoiding indoor smoking, and reducing the use of unvented gas appliances can make a significant difference. For workplaces, the DOLE-OSHC has highlighted the link between indoor air quality and productivity, so employees and employers alike have a stake in monitoring and improving indoor environments.
Support Science-Based Policymaking
The UP CARE program is funded by the Department of Science and Technology, and its continued operation depends on sustained public investment. Supporting science-based approaches to environmental management — whether through public advocacy, participation in consultations, or engagement with academic institutions — helps ensure that decisions about air quality are grounded in evidence rather than guesswork. The EMB’s ongoing updates to air quality guidelines and policies provide a window for public input, and stakeholders can participate in consultations or submit comments during the review process.
Frequently Asked Questions About Philippine Air Quality Monitoring
How accurate are low-cost air quality sensors compared to official monitoring stations? â–ľ
Can I access UP CARE air quality data as a private citizen? â–ľ
How can my LGU partner with UP CARE to install sensors? â–ľ
Does the UP CARE system monitor indoor air quality? â–ľ
What pollutants do the UP CARE sensors measure? â–ľ
What Comes Next for Air Quality in the Philippines
The UP CARE program represents a practical step toward making air quality data more accessible, but it is only one piece of a larger puzzle. The EMB is simultaneously working on digital transformation of air quality monitoring through training workshops and system upgrades, while also engaging with international partners like Clean Air Asia and the World Bank to strengthen science-based air quality planning. For residents and local governments, the immediate opportunity is clear: where sensors exist, use the data. Where they do not, advocate for their installation. The technology is available, the cost is lower than ever, and the policy framework is being updated to accommodate it. If this was useful, you might also want to read our breakdown of Metro Manila’s air pollution causes and impact.
Sources
Pollution’s impact on public health in the Philippines — Explores the health consequences of poor air quality and what they mean for Filipino communities.
CIDS RTD features UP-made air quality monitoring system. University of the Philippines, 2025.
UP develops low-cost air quality monitoring system. Philstar.com, 2025.
Environmental Management Bureau Air Quality Management Section. DENR-EMB, 2025–2026.
