If you use “natural” or “organic” peanut butter (read, ingredients: peanuts) you’ll want to refrigerate it. It helps keep the oil from separating. It’ll be the consistency of jiff or other sugared brands for most of the jar. I usually take mine out of the fridge when you get towards the bottom so it doesn’t get too hard.
At 85 dB you’ll have hearing damage from long term exposure without hearing protection. Normally considered 8 hours a day 5 days a week. So 2000 hours in a year. Higher sound levels have a lower threshold so shorter times. 120 dB is the threshold of pain, so immediate hearing damage. Also, dB are a 10x log scale. So every 10 dB is an order of magnitude increase. So the siren is actually about 3000x louder than when you should start wearing earpro.