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In page Fireworks:

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Pollution is also a concern because fireworks often contain heavy metals as source of color.[10][11] However, gunpowder smoke and the solid residues are basic, and as such the cumulative effect of fireworks on acid rain is uncertain.[citation needed] What is not disputed is that most consumer fireworks leave behind a considerable amount of solid debris, including both readily biodegradable components as well as nondegradable plastic items. Concerns over pollution, consumer safety, and debris have restricted the sale and use of consumer fireworks in many countries. Professional displays, on the other hand, remain popular around the world.