EXPLAINER: What are PM2.5 pollutants, and how are they linked to the haze?

CEBU CITY, Philippines — Reports of elevated levels of fine particulate matter, or PM2.5, have recently made the rounds as transboundary haze from Indonesia’s forest fires continues to affect parts of the Philippines. In Metro Cebu, PM2.5 concentrations reached “acutely unhealthy” levels at their peak, raising concerns over the possible health effects of exposure to

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