'strong odor' is correct and usable in written English.
It can be used to describe a smell that is intense and pungent. For example, "The strong odor of rotting food filled the room."
There was also "the often strong odor about his person".
There was a strong odor in the house.
11/03/03: Deliverer smelled strong odor of gas when entered client's apartment.
"I detected a strong odor of liquor on his breath," he said.
Garlic, perhaps because of its strong odor, has long been said to be that magic food.
It smelled stale and had a strong odor of fermented olives.
And it wasn't just the introduction of a strong odor: "We tried vanilla smell.
The catfish, attracted by the dolphins' strong odor, quickly latch onto the bait, fishermen said.
R/O was able to see victim on sofa with flies on victim and a very strong odor decay.
There was no fire or explosion, though white smoke curled up and there was a strong odor of gasoline.
Teas and Pean were inferior due to bitter taste and strong odor.
