Fireworks are spectacular, but they have a serious ecological and public health cost. Explosion residues and smoke alter water chemistry, degrade air quality, and release persistent substances. Several recent studies detail these effects.
The debris of firecrackers, once extinguished, are not harmless. A laboratory study published in
Environmental Science & Technology shows that these residues, when they end up in lakes or rivers, alter water chemistry. They release metal ions, such as potassium and manganese, as well as dissolved organic matter. In parallel, the remaining solids absorb other substances already present, disrupting the balance of aquatic ecosystems.
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During large gatherings, air pollution is very real. Researchers, in
ACS ES&T Air, monitored fine particles during a multi-day sporting event in the United Kingdom: they noted clear peaks of coarse and fine particles. Cooking from street vendors and dust raised by vehicles contributed greatly, but the opening and closing ceremonies added an additional increase in pollutants. People present each day exceeded the thresholds recommended by the World Health Organization.
Beyond visible smoke, fireworks emit amines, compounds that react in the air to form aerosols. A Chinese study published in
Environmental Science & Technology Letters measured these substances during the Lunar New Year. Amine concentrations increased sharply during the largest pyrotechnic displays. Other pollutants, such as sulfates and potassium ions, also rose.
The consequences for human health are concerning. Fine particles, especially those emitted by fireworks, penetrate deep into the lungs. Studies indicate that exposure during major events can exceed the limits set to protect the population. In the long term, repeated episodes could worsen respiratory or cardiovascular problems.
In the short term, collecting firecracker debris after use would limit water contamination. More sustainably, using less polluting formulations and reducing the duration of shows would improve air quality.