Eucalyptus
Improves indoor air quality, eliminates toxins according to the University of Sindey. It also has antimicrobial properties according to the University of Aveiro and relieves nasal congestion according to the University of Maryland.
Roses
Chiva Japanese University: has conducted studies on the effects of red roses on the physiological and emotional responses of people. Researchers have explored how the scent of red roses it can affect stress levels, blood pressure, and cortisol levels.
References: Journal of Environmental Psychology, Complementary Therapies in Medicine, Journal of Alternative and Complementary Medicine