heavily/seriously/severely polluted• There was little information on the health of people living in that area, which had been known to be heavily polluted.• Water in the area is severely polluted.• The city is being severely polluted by an array of emission-releasing industries, an oilrefinery and three million cars.• The river is already heavily polluted by chemical and metallurgical industries.• Sometimes there were sandy heaths which looked like parts of Surrey and sometimes massive, sulphurous and heavily polluted industrial plants.• In general, in the authority's industrialized areas the emphasis in pollution control is on cleaning up heavily polluted rivers.