 Ramba uchinyora ndima iyi - Muenzaniso wakaipisisa wakanyorwa wakanga uri Great Smog ya1952, apo kufa kwevanhu 4 000 kwakashumwa muguta racho mumazuva mashomanana, uye kwakazotevera kufa kwevanhu 8 000 kwakakonzera kuti mutemo weClean Air Act wa1956 upfuudzwe, uyo wairambidza kushandiswa kwemarasha pamoto mudzimba mune dzimwe nzvimbo dzomumaguta. Nhamba yose yavakafa muchinoitika ichocho zvino inofungidzirwa kuva inenge 12 000. 