For each fireworks display, there should be some professional fireworks safety agency to monitor how these are being deployed, and making sure that whoever deploys them is respecting the law including noise levels and how the firework explosions' chemicals are within the thresholds as these can affect everyone's health (For more info read this old but still valid Times article: http://bit.ly/2qhvvbz). Results of the monitoring should be constantly uploaded online with all the details available
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