Haze from Indonesian Fires Blankets Metro Manila, Triggering Health Alerts

Air quality in the Philippines capital region has deteriorated to "acutely unhealthy" levels as smoke from suspected Indonesian forest fires drifts across the country, government monitors confirmed Monday.

The Department of Environment and Natural Resources – Environmental Management Bureau (DENR-EMB) reported that haze has reached the National Capital Region (NCR), Calabarzon, and Mimaropa, prompting urgent public health advisories and raising concerns about the long-term impact of transboundary pollution in Southeast Asia.

What We Know

According to the DENR-EMB's latest monitoring data, particulate matter concentrations in Metro Manila have surged to levels classified as "acutely unhealthy" on the Air Quality Index (AQI). The affected regions include:

• NCR (Metro Manila) – 16 cities and municipalities
• Calabarzon – Cavite, Laguna, Batangas, Rizal, and Quezon provinces
• Mimaropa – Mindoro, Marinduque, Romblon, and Palawan

The agency has attributed the haze to smoke from agricultural and forest fires in Indonesia, a recurring phenomenon during the dry season when slash-and-burn practices are common in Sumatra and Kalimantan.

Health Officials Urge Caution

The Department of Health (DOH) has issued an advisory recommending that residents in affected areas limit outdoor activities, particularly children, the elderly, and individuals with pre-existing respiratory conditions. Schools in several Metro Manila districts have been advised to suspend outdoor physical education classes and extracurricular activities.

"Prolonged exposure to particulate matter can cause respiratory irritation, aggravated asthma, and cardiovascular stress," said a DOH spokesperson in a statement. "We urge the public to wear N95 masks when going outdoors and to keep windows closed during peak haze hours."

A Recurring Regional Problem

This is not the first time the Philippines has experienced transboundary haze from Indonesia. Similar events occurred in 2015 and 2019, when El Niño conditions exacerbated fire activity in Indonesian peatlands, blanketing much of Southeast Asia in thick smoke.

However, environmental experts note that this year's haze arrives unusually early and with greater intensity than recent years. Satellite imagery from the ASEAN Specialised Meteorological Centre shows active fire hotspots concentrated in Indonesia's South Sumatra and Central Kalimantan provinces.

Economic and Social Implications

The haze carries significant economic consequences beyond public health concerns:

• Aviation disruptions – Reduced visibility has already caused flight delays at Ninoy Aquino International Airport (NAIA)
• Tourism impact – Popular destinations in Palawan and Batangas may see cancellations as travelers avoid hazy conditions
• Productivity losses – Outdoor workers in construction and agriculture face health risks and potential work stoppages

Regional Cooperation Under Scrutiny

The situation reignites questions about the effectiveness of the ASEAN Agreement on Transboundary Haze Pollution, ratified in 2002. While Indonesia ratified the agreement in 2014, enforcement of anti-burning laws remains inconsistent, and the region continues to face annual episodes of severe air pollution.

Philippine lawmakers have called for stronger diplomatic engagement with Indonesia and Malaysia to address the root causes of the fires, including sustainable land management practices and economic alternatives to slash-and-burn agriculture.

Looking Ahead

The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) forecasts that prevailing winds will continue carrying smoke from the southwest through the coming week. Weather conditions—particularly rainfall—will be critical in determining how long the haze persists.

"Without significant precipitation, we could see air quality remain at unhealthy levels for several more days," said a PAGASA forecaster. "Monsoon rains typically arrive in late September, which could provide relief."

Residents are advised to monitor official air quality updates from the DENR-EMB and take necessary precautions. The situation serves as a stark reminder that environmental challenges in one country can rapidly become a public health crisis in another, underscoring the urgent need for coordinated regional action on climate and land-use issues.