Blue-green algae can be a real buzzkill for those looking to cool off with a dip at one of Halifax's 20 supervised beaches, but new data from researchers at Dalhousie University suggests the risk to humans who go swimming when the algae is present has been limited over the past few years. 

The team monitored eight recreational beaches over three years and found that though the genes that produce blue-green algae were present at each site, the toxins detected were well below Health Canada's accep…