Ash spewed by a Philippine volcano is being mixed with plastic waste to make bricks in an inventive response to the country's persistent problems of pollution and frequent natural disasters.

The Taal volcano burst into life nearly a week ago, sending towering dust columns into the sky and leaving nearby Binan city coated in fine grey powder.

Environment officials did not just clean up the mess but decided to combine the ash with sand, cement and discarded plastic to form about 5,000 bricks per day for local building projects.

"Instead of just piling up the ashfall somewhere, we are able to turn it into something useful. And it includes plastics, too," said city environmental officer Rodelio Lee.

The Philippines faces a waste crisis, with a report last year saying it uses a "shocking" amount of single-use plastic, including nearly 60 billion throwaway sachets per year.