On kto czuł to, rozdał to?
"That gas smells strongly" Or is that too far from the Polish sentence?
My first guess was odor.
Well, technically "zapach" is neutral in meaning, but somehow it seems safe to assume that this smell here is unpleasant.
Could "mocny" work here instead of "silny"?
Yes, I guess so. Added.
People can smell when you Taco Bell
What about aroma.
"aroma" is a nice food or coffee smell. I don't think it really applies to a strong gas smell.
In the states we use odor for gas most often, all warnings say if you smell odor of gas, shut aplliance off.
Both "odour" and "odor" are accepted, it seems. Do you have evidence to the contrary?
Odor, gas has a srong odor most often used.