Re: From observation ...
Brings back memories of the "Burnhouse" animal waste plant outside Lisburn in N Ireland. There were days when you daren't drive past that place with the car window open if the wind was blowing in the wrong direction. I was in their yard once, on business, when a lorry came in. It was the same sort of lorry that you see delivering sand or gravel to building sites, but this one backed into a corner of the yard, tipped up, and unloaded tons of animal carcasses & other waste from abattoirs. I have no idea how the people who worked there every day coped with that smell. Long since closed, thank goodness.