Southerly winds brought large quantities of fine sand from the Sahara to south-east Europe on Wednesday, with particulate matter levels of more than 500 micrograms being measured in western Greece. According to the University of Athens, the high levels of particulate matter are expected to continue for several days. In addition, temperatures on the island of Crete reached up to 32 degrees Celcius on Wednesday, while in Athens it was 24 degrees at one point. Doctors advised people suffering from respiratory or heart conditions not to spend too much time outdoors. Physically strenuous work shoul…