Residents in some parts of Muntinlupa City have complained of difficulty in breathing, asthma attacks, stomach pains and nasal clogging reportedly due to decaying algae in Laguna Lake. The city health office said the foul smell could be attributed to the growing number of “liya” - a filamentous freshwater green algae present during warm weather - in the lake.

Algae emits 'sickening' smell in Muntinlupa. (2019, June 8). The Philippine Star, p. 10.