METRO Manila’s morning rush used to be measured by traffic and coffee lines. Lately, it’s measured by sweat. As temperatures climb and humidity stays oppressive, workers like construction crews, delivery riders, office staff and market vendors are finding shifts physically harder, less productive and possibly dangerously unsafe. National climate and health agencies have recorded worrying heat-related illness and death. Global analyses signal that these pressures will only intensify unless urgent action is taken.
Between the first four months of 2024, the Department of Health recorded dozens of heat-related illnesses and several deaths. In 2023, the country registered hundreds of cases. Local heat-index readings show Metro Manila reaching the “danger” range, roughly 42 degrees Celsius to 51 C, where even short exposures can overwhelm the body’s cooling systems. International projections underline the scale of the threat: the International Labor Organization (ILO) estimates that, under a 1.5 C pathway, heat stress could reduce total working hours worldwide by about 2.2 percent in 2030, roughly equivalent to 80 million full‑time jobs. That figure rises to about 3.8 percent (around 136 million full‑time jobs) for work done in direct sunlight.
An ILO report cited that heat stress could wipe out the equivalent of 80 million full‑time jobs by 2030, and up to 136 million if work continues in direct sunlight.
The mechanisms are simple and brutal. As core body temperatures rise, physical stamina and fine motor control decline. Cognitive functions such as attention, memory and decision‑making also deteriorate, increasing the likelihood of errors and accidents. Physiologists warn that body temperatures above 38 C begin to impair function, and temperatures approaching 40.6 C sharply increase the risk of organ damage, loss of consciousness and death. In a densely built, humid megacity like Metro Manila, high humidity compounds the problem by reducing the effectiveness of sweat-based cooling and making perceived heat far worse.
The burden will not be shared evenly. Agriculture and construction are projected to carry the lion’s share of lost working hours, together accounting for roughly 60 percent and 19 percent of projected losses in 2030. This will place already vulnerable communities at heightened risk of income loss and health harms. Regions like Southern Asia, where large numbers of people work outdoors or in poorly ventilated conditions, stand to lose a larger share of working hours than the global average. Locally, the poorest, most informal workers — street vendors, delivery riders, day laborers and those in precarious jobs — have the fewest options for protection or paid leave and therefore face stark choices between health and subsistence.
Policy measures
For employers and the economy, each heat-related incident translates into lost hours, lower per‑hour productivity and higher health costs. Even air‑conditioned offices are not immune: higher cooling costs during extreme heat can push small firms and schools into under‑cooled settings that sap performance and increase absenteeism. Sustained heat can shrink effective labor supply in crucial sectors, disrupt supply chains and deepen inequality.
There are practical, evidence-based steps that can blunt the immediate impact. Employers should adopt heat‑safe workplace policies: shift heavy tasks to cooler hours; mandate regular rest and hydration breaks; provide shaded or cooled rest areas; equip workers with appropriate PPE; and train supervisors to recognize early signs of heat illness. For outdoor and informal workers, low‑cost interventions such as portable shade, distributed water and electrolyte solutions, staggered schedules and shaded loading points can be lifesaving. Urban planning measures like expanding shaded walkways, planting trees, promoting cool roofs and opening public cooling centers during heat waves reduce ambient temperatures and protect workers commuting and waiting outdoors.
Policy measures strengthen and scale these solutions. Integrating temperature and humidity into occupational safety and health regulations, deploying early warning systems that translate heat-index readings into specific workplace actions and expanding social protections like paid heat‑sick leave and subsidies for cooling in low‑income neighborhoods all help to distribute risk more equitably. Social dialogue, where governments, employers and worker representatives co‑design sector‑specific protections, has proven effective in creating enforceable, context‑sensitive measures.
Protecting workers demands the longer view: ambitious climate mitigation to limit global warming, paired with investments in resilient infrastructure and just‑transition policies that help workers move out of the most heat‑vulnerable jobs. Electrification, decarbonization and expanded green cover reduce future heat risk and can create jobs if policies prioritize fairness and skills development.
Metro Manila’s workforce is the nation’s lifeblood, contributing 31.2 percent to the country’s gross domestic product, according to the Philippine Statistics Authority 2024 data. Shielding workers from the sun’s increasingly fierce reach is both a moral obligation and an economic necessity. Combining immediate workplace protections, targeted social safety nets and rapid urban cooling investments offers the best chance to preserve productivity. It saves lives and prevents rising heat from hollowing out incomes and widening inequality. The alternative is a slow, costly erosion of livelihoods. The choice is to act now and plan for resilience.
The author is the founder and chief strategic advisor of the Young Environmental Forum and a subject-matter expert at the Co-operative College of the Philippines. He completed a climate change and development course at the University of East Anglia (UK) and an executive program on sustainability leadership at Yale University (USA). You can email him at ludwig.federigan@gmail.com.