YEAR after year, health experts have warned that air pollution in Metro Manila, a global megacity, has worsened from an environmental problem to a serious public health concern.
More than 13 million of the country’s 117 million population who live within the lines of 636 square kilometers – comprising 16 cities and one municipality – are daily exposed to pollution levels that surpass global safety standards.
Authorities say Metro Manila’s air quality often fluctuates, frequently falling into the “Moderate” category with PM2.5 levels exceeding guidelines from the World Health Organization, making it a significant health concern.
Globally, Southeast Asia bears a high PM2.5 burden, with countries like Indonesia and Vietnam experiencing severe pollution, though it varies greatly by region and time, as gleaned from reports highlighting Manila as one of the world’s most polluted cities at times.
PM2.5 has been raised as the primary concern, stemming from vehicle emissions and industrial activities, creating near-constant smog, with environmental specialists classifying it as a serious health crisis, with millions exposed to dangerous levels, contributing to respiratory and cardiovascular diseases.
Cardiovascular and respiratory diseases are major health concerns across the country, including Metro Manila, with ischaemic heart diseases consistently popping up as the leading cause of death nationwide for several years: in 2023, for instance, 22,027 were recorded deaths nationally.
Pneumonia and chronic lower respiratory diseases are also consistently ranked among the top causes of mortality, with at least 33,040 pneumonia cases recorded as a cause of death nationwide as of March 31, 2025.
While global conditions are diverse, some areas see drastic improvements while major cities worldwide face daily severe pollution, making real-time data essential.
The Philippine government, through agencies like the Department of Environment and Natural resources and the Department of Transportation, has been addressing Metro Manila’s air pollution via the Clean Air Act, focusing on stricter emission standards.
Such standards cover cleaner fuels like Euro 4, enhanced monitoring – roadside, construction– promoting sustainable transport – bike lanes, car-free zones, EVs – improving waste management, and public awareness campaigns, all supported by international partnerships and plans like the NDC Implementation Plan.
This whole-of-government strategy is the country’s detailed roadmap for achieving its climate goals under the Paris Agreement, translating broad commitments – like emissions reduction targets and adaptation measures – into concrete actions, policies, timelines, costs, and responsibilities across sectors.
We note the DENR has reported a significant decrease in key pollutants in Metro Manila, with PM10 levels dropping by 17.4percent and PM2.5 levels by 37.6 percent between 2016 and 2024.
The enactment and implementation of the Philippine Clean Air Act has also shifted the gear to providing a comprehensive legal basis for pollution control, leading to an increased recognition of the need for action.
In the main, while the government has made notable strides and achieved measurable reductions in some pollutants, the situation remains a critical public health issue requiring continued, strengthened commitment and the expansion of effective strategies across the entire metropolis.
