Probably doesn’t hurt mentioning again, that construction wood waste and older (MB) pallets contain chemical arsenic (preservative) that escapes into the air for all to inhale. No log burner or fireplace can filter this out. Best not inflict upon unsuspecting neighbours.
If you cannot clearly read a stamped on EUR, EPAL or MB because it has washed/rubbed off, then best don’t burn.
As with many things, you possibly can but should you?
It was/ is Stella, but once again due to lack of interest by authorities, it’s not enforced and many unscrupulous outlets are still selling expensive junk.
Sadly, for many people in the UK it’s not an environmental concern, it’s more a choice between being warm or freezing because they can afford the outrageous gas/electricity prices. Even worse folk are opening up fireplaces that they have no idea if they’re safe or having poor quality log burners installed by cowboys. No one’s talking about it yet, far too interested in the ongoing Tory saga, but I imagine sooner or later it’ll become a talking point but only after there’s been a number of fatalities.
Possibly, even more dangerous and likely to occur, is people using disposable charcoal grills, or coal, without adequate ventilation = carbon monoxide poisoning.
To say nothing of burning resinous wood like pine which causes tar to stick to the fluepipe and thus catching fire eventually.