(x – 21,071 tonnes, 46 per cent in or near areas of dense population (2) SO 2 – 62,363 tonnes, 20 per cent in or near areas of dense population (3) Particulate matter (PM 10 ) – 591 tonnes, 32 per cent in or near areas of dense population* (4) Lead (Pb) – Emera does not consider lead emissions to be material to its operations.