The magnitude of bad deeds in every place only increases in the aspect of the manner, and not in the aspect of an actual number. This is due to the statement of Allah:
"Whoever brings a good deed, he will have ten times the like thereof to his credit, and whoever brings a bad deed, he will only have the recompense of the like thereof, and they will not be wronged." (Al-An'am 6:160)
This is also due to what is confirmed in the authentic Hadiths that allude to this same meaning. However, the evil deeds vary in their sinfulness according to their actual greatness or smallness; and also according to the time, like Ramadhan and the ten days of Thul-Hijjah;and according to the place, like the two sacred cities (Makkah and Al-Madinah), and for other reasons. And Allah is the Giver of success.