Too much exposure to both UVA and UVB rays raises your risk of skin tumors, including a form of cancer called squamous cell carcinoma.

Of the cases identified on the campaign day in 2008, more than 3000 were basal cell carcinomas (non-melanomas) and 354 were malignant melanomas, the most deadly type of skin cancer.

The researchers plan to characterize skin odor profiles associated with other forms of skin cancer, including squamous cell carcinoma and melanoma, the most serious form of skin cancer.