> Bad smells are certainly a proxy for diseases to some extent
No, they are not. Because smell and germs are completely unrelated. There is a limited case where they are correlated (don’t play with organic waste or too old corpses), but even then it is not really helpful. This is why it took so long to understand how to stop cholera: you can have things in your water even if it looks pristine. The air is just a red herring.
It is not even helpful with airborne pathogens, as once they start spreading among humans all bets are off.
No, they are not. Because smell and germs are completely unrelated. There is a limited case where they are correlated (don’t play with organic waste or too old corpses), but even then it is not really helpful. This is why it took so long to understand how to stop cholera: you can have things in your water even if it looks pristine. The air is just a red herring.
It is not even helpful with airborne pathogens, as once they start spreading among humans all bets are off.