The scent of Christ is associated with the revelation of His person and as the Holy Spirit fills the atmosphere with that revelation the church is transformed not for an hour or two, but also for the other six days of each week.
The fragrance of Christ is brought forth in the fruit of the Spirit.
"But the fruit of the Spirit is love, joy, peace, longsuffering, kindness, goodness, faithfulness, gentleness, self-control. Against such there is no law. And those who are Christ’s have crucified the flesh with its passions and desires. If we live in the Spirit, let us also walk in the Spirit. Let us not become conceited, provoking one another, envying one another." - Galatians 5:22-26
To the discerning, the fragrance of Christ is not rested upon those "doing church" but upon those in whom Christ is being formed - those being transformed into the likeness of Christ.
The fragrance of Christ is supernatural, church without Christ is merely synthetic. Another words the scent produced by Christ is Heavenly and aromatic among others and before the Father. Jesus in His church never stinks.
2 Corinthians 2:14
Now thanks be to God who always leads us in triumph in Christ, and through us diffuses the fragrance of His knowledge in every place.