Volunteers of the annual Brigada Eskwela, a clean up and school maintenance program of the Education Department, burn trash as they clean the school premises inside SIR Elementary School in Davao City. However, environment watchdog has warned of burning trash as this may discharge toxins that can trigger illnesses. (Ace R. Morandante/davaotoday.com)

Volunteers of the annual Brigada Eskwela, a clean up and school maintenance program of the Education Department, burn trash as they clean the school premises inside SIR Elementary School in Davao City. However, environment watchdog has warned of burning trash as this may discharge toxins that can trigger illnesses. (Ace R. Morandante/davaotoday.com)

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