What kind of air masses originate in Canada?

The primary air masses that originate in Canada are continental polar (cP) and maritime polar (mP) air masses. Continental polar air masses develop over the cold land areas, bringing dry and cool conditions, while maritime polar air masses form over the relatively warmer waters of the Pacific and Atlantic Oceans, resulting in moist and cool weather. These air masses can influence weather patterns across North America, particularly during winter months.