[header] How to cope with loud fireworks if you're autistic [title] Put in earplugs. [step] Basic foam earplugs can block around 30 decibels of sound, which can help take the edge off of the noisy fireworks. [title] Wear ear protection earmuffs. 
[step] These heavy headphones were designed for working with leaf blowers and other loud equipment, and they block around 20-30 decibels (depending on the brand). These can be useful for walking or sitting, but will result in a sweaty head if you wear them overnight.