KORONADAL CITY, South Cotabato — Air quality here worsened at certain hours since Tuesday, with fine particle pollution reaching “emergency” and “very unhealthy” levels as the Environmental Management Bureau-Region 12 (EMB-12) continued its haze watch. Based on EMB’s special air quality monitoring, the PM2.5 Air Quality Index (AQI) reached 312.8 at 6 p.m. Tuesday, placing
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