Manila’s Air Quality Declared ‘Unhealthy’ on New Year’s Day

On New Year’s Day 2025, the air in Manila was officially classified as “unhealthy,” with the city’s Air Quality Index (AQI) reaching 167 at noon. That reading, recorded by Swiss air quality technology company IQAir, placed the city 22nd globally among the most polluted urban centres at that moment. The primary culprit was a fine particle known as PM2.5, which measured 78.4 micrograms per cubic metre — a concentration 15.7 times higher than the World Health Organization’s annual guideline value. For anyone in Metro Manila that day, the haze was more than a visual nuisance; it represented a direct and measurable health risk.

These numbers are not abstract. PM2.5 particles are small enough to bypass the body’s natural defences. As IQAir noted, they can be absorbed into the bloodstream upon inhalation, making them the pollutant that poses the greatest health threat. The Department of Environment and Natural Resources-Environmental Management Bureau (DENR-EMB) reinforced this, warning that such fine particles can damage both the respiratory system and the bloodstream. For context, the US Environmental Protection Agency classifies PM2.5 levels between 55.5 and 150.4 µg/m³ as unhealthy for a 24-hour exposure window. Manila’s reading sat squarely in that band. The spike was not an isolated event — it followed a pattern seen every New Year, when fireworks and other celebrations send pollution levels soaring. Understanding what drove this year’s numbers, and what they mean for public health, requires looking beyond the headline figure. For a broader view of how pollution affects the country, you can read about the plastic peril facing Philippine ecosystems.

What the New Year’s Air Quality Data Actually Shows

The most important thing to understand about New Year’s air quality is that the annual spike is severe but short-lived. Real-time data from the Manila Observatory’s AS-LUNG personal samplers, which measure particulate matter every 15 seconds, captured the intensity of the event. In Antipolo, concentrations hit 373 µg/m³ shortly after midnight. In Fortune, Marikina City, the peak was 260 µg/m³, and in Tandang Sora, Quezon City, it reached 225 µg/m³. All of these are classified as alarmingly unhealthy. The most extreme reading came from San Jose del Monte (SJDM), Bulacan, where a peak of 748 µg/m³ was recorded around 8:50 PM on December 31, likely from a combination of firecrackers, vehicle exhaust, and grilling during Media Noche preparations.

These figures are not just numbers on a chart. They represent acute exposure levels that can trigger immediate health effects, especially for people with pre-existing conditions. The Department of Health reported 843 firework-related acute injuries for the 2025 New Year period, a 38% increase from the previous year. While that count covers physical injuries, the respiratory toll is harder to quantify but no less real. The DOH has warned that continuous high-level exposure to fireworks can lead to chronic or allergic bronchitis, bronchial asthma, sinusitis, rhinitis, pneumonia, and laryngitis. The DENR-EMB also noted that cooler weather can trap pollutants near the ground, making dispersion slower and exposure longer.

Why the Spike Happens and What Makes It Worse

The New Year’s pollution spike is driven by a predictable set of activities. Fireworks release metal salts and other toxic substances that the DENR-EMB says can cause cancer or have carcinogenic effects. But fireworks are only part of the story. In Metro Manila, common year-round sources of PM2.5 include vehicular traffic, construction activities, sea salt, road dust, waste management, and biomass burning. On New Year’s Eve, these are joined by revving motorcycle and car engines — a tradition in some areas — and the smoke from outdoor cooking. The result is a multi-source pollution event that hits hardest in densely populated urban areas.

Not all areas experienced the same intensity. The 24-hour MiniVol samplers deployed by the Manila Observatory showed that unhealthy PM2.5 levels were recorded in Kaimito, Pasig (123 µg/m³); Antipolo, Rizal (106.2 µg/m³); Katipunan, Quezon City (87.4 µg/m³); and Nangka, Marikina City (82.2 µg/m³). All of these sites had also recorded unhealthy levels in 2024. However, the trends varied: Kaimito saw a 13% increase, Antipolo a 36% increase, and Katipunan a 10% increase, while Nangka actually recorded a 19% decrease. Meanwhile, Parañaque City (37.8 µg/m³) and Calumpit, Bulacan (37.3 µg/m³) reported levels that were unhealthy only for sensitive individuals. The contrast is stark: Parañaque’s levels increased by 432% compared to the previous year, while Calumpit improved by 72%. These differences highlight how local wind patterns, geography, and the intensity of nearby celebrations can dramatically alter exposure from one neighbourhood to the next.

One pattern worth noting is the delayed peak observed at the Manila Observatory and Nangka sites. Unlike the sharp midnight spikes seen elsewhere, these locations showed a wide envelope of gradually increasing concentrations that started in the early evening of December 31 and peaked after midnight on January 1. The Manila Observatory, an urban mixed site, likely experienced this delay because PM2.5 from fireworks and vehicles took more time to be advected to the location. This means that even areas not directly in the middle of celebrations can still experience significant pollution hours later, as the particles drift with the wind. For a deeper look at how environmental policies intersect with public health, see the discussion on how lost forests lead to dirtier air in the Philippines.

What Often Gets Overlooked in the Annual Pollution Debate

Most discussions about New Year’s air quality focus on the immediate spike, but several important nuances are frequently missed. The first is that the long-term trend is actually improving. Data from the Manila Observatory shows that the site’s average PM2.5 concentration dropped from 258.6 µg/m³ (2006–2015) to 66.5 µg/m³ (2016–2025) — a 74% decrease. The Nangka site saw a similar drop from 359.3 µg/m³ to 84.2 µg/m³, a 76% reduction. These improvements are likely linked to the DOH’s campaign against fireworks, the PNP’s anti-illegal firecracker drive starting in 2015, former president Rodrigo Duterte’s Executive Order limiting fireworks to community displays in 2017, and the total ban on fireworks in 2020. The yearly spike remains, but the baseline has shifted significantly downward.

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A second overlooked factor is the role of weather. The DENR-EMB noted that cooler weather can hinder the dispersion of air pollutants, trapping them closer to the ground. This means that a cold New Year’s night can make the pollution worse than a warmer one, even if the same number of fireworks are set off. Rain, on the other hand, can help clear the air — but it is not a reliable solution. Third, the health risks extend beyond the immediate respiratory effects. The DOH has linked continuous high-level exposure to fireworks with cardiovascular complications, including chronic or allergic bronchitis, bronchial asthma, sinusitis, rhinitis, pneumonia, and laryngitis. These are not just short-term irritations; they represent real, documentable health burdens that strain both individuals and the healthcare system. Finally, the data shows that the most intense exposure often happens indoors. Many homes in Metro Manila are not sealed against outdoor air, meaning that PM2.5 can infiltrate living spaces, especially during the hours-long peak. For more on how pollution sources interconnect, read about the impact of Filipino waste on the environment.

What You Can Actually Do About New Year’s Air Pollution

While you cannot control the city’s air quality single-handedly, there are practical steps you can take to reduce your exposure during the New Year period. These actions are most effective when planned ahead of time, not in the middle of the spike.

Monitor Real-Time Air Quality Before Going Out

Several platforms provide live AQI readings. IQAir’s website and app, as well as the Manila Observatory’s data feeds, offer neighbourhood-level information. Check these before heading out on the evening of December 31. If the AQI in your area is already above 100, consider limiting outdoor activity. The US EPA’s classification system is a useful reference: 0–50 is good, 51–100 is moderate, 101–150 is unhealthy for sensitive groups, and 151–200 is unhealthy for everyone. On New Year’s Day 2025, Manila’s reading of 167 fell squarely in the “unhealthy for everyone” range.

Create a Clean Indoor Space

If you live in a high-pollution area, designate one room as a clean-air zone. Close all windows and doors, and use an air purifier with a HEPA filter if available. If you do not have an air purifier, a DIY box fan filter — a standard 20-inch box fan taped to a MERV-13 furnace filter — can reduce indoor PM2.5 levels significantly. Run the purifier or fan on high starting a few hours before midnight and keep it running until the next morning. This is especially important for households with children, elderly members, or anyone with asthma or respiratory conditions.

Time Your Outdoor Exposure Carefully

The data shows that the most dangerous window is between 11:30 PM on December 31 and 1:30 AM on January 1. If you plan to watch fireworks, do so from indoors or from a location upwind of the main celebration areas. Avoid standing near clusters of people setting off firecrackers or revving engines. If you must be outside, wear an N95 or KN95 mask — cloth masks and surgical masks offer little protection against PM2.5. The DENR-EMB’s Engr. Jundy del Socorro specifically advised at-risk individuals to stay indoors to minimize exposure.

Understand the Long-Term Regulatory Context

The improvements seen over the past decade — a 74% drop at the Manila Observatory site — are not accidental. They are the result of policy changes, including the 2017 Executive Order limiting fireworks to community displays and the 2020 total ban. However, enforcement varies, and the 38% increase in firework-related injuries in 2025 suggests that compliance may be slipping. If you are concerned about air quality, supporting local enforcement of existing regulations and advocating for community-based fireworks displays rather than individual use can make a difference. For a related perspective on how environmental regulations affect public health, see the article on sewage threats and public health risks.

Frequently Asked Questions

What to Watch for Next Year

The New Year’s air quality data from 2025 confirms a pattern that has held for years: the spike is severe, predictable, and largely preventable. The long-term trend is encouraging — a 74% reduction in average PM2.5 at the Manila Observatory over the past decade — but the annual peak remains a public health concern. For next year, the most useful thing you can do is prepare ahead. Check real-time air quality data before heading out, create a clean indoor space, and time your exposure to avoid the midnight peak. If this was useful, you might also want to read how climate change threatens Philippine food security.

Sources

Tackling plastic pollution in the Philippines — A look at another major environmental challenge facing the country and what is being done about it.

Tourism’s impact on coastal pollution in the Philippines — Explores how tourism contributes to pollution in coastal areas and what travellers can do.

Manila’s air quality ‘unhealthy’ on New Year’s Day. Daily Tribune, 2025.

Particle pollution levels in Metro Manila and other urban areas: New Year 2025 measurements. Manila Observatory, 2025.