Every year at this time, people warn us about fireworks?they’re dangerous, they can start fires, etc. But what OUR readers want to know is, are they also bad for our health?

Colorful explosives may use potassium perchlorate, a chemical, also used in dry cleaning, that has been connected to deterioration of the thyroid gland. But the burning of the fireworks consumes most of this.
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On July 4th, most of us are going to watch fireworks. The Chinese invented fireworks sometime between 200 BC and 900 AD. The US has been using fireworks to celebrate Independence Day since 1777, before we even knew if we would survive as an independent country. But few of us know what’s actually in them.
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