Are fireworks bad for the environment?

Are fireworks bad for the environment?  
http://www.mnn.com/earth-matters/translating-uncle-sam/stories/are-fireworks-bad-for-the-environment 
 
"Fourth of July fireworks unleash a shower of toxins into the soil and water, and scientists are only beginning to figure out what that means for human health. The rockets' red glare on the Fourth of July can fill onlookers with patriotism and awe. Unfortunately, it can also fill them with particulates and strontium.

Fireworks get their flamboyance from a variety of chemicals, many of which are toxic to humans. From the gunpowder that fuels them to the metallic compounds that color their explosions, fireworks often contain radioactive, carcinogenic or endocrine-disrupting substances that seep into soil and water, potentially threatening animals throughout the food chain."