A kiln is a thermally insulated chamber, a type of oven, that produces temperatures sufficient to complete some process, such as hardening, drying, or chemical changes. Kilns have been used for millennia to turn objects made from clay into pottery, tiles and bricks. Various industries use rotary kilns for pyroprocessing to calcinate ores, to calcinate limestone to lime for cement, and to transform many other materials.Environment Protection Department (EPD) has again extended the date of closure of all the brick-kilns for two months to avoid smog in the days to come.EPD Chairman Punjab Dr Pervaiz Hassan after successful negotiations with Brick kilns Association announced that all brick kilns in the province would be closed from November 3, keeping in view the weather condition, a press release issued by Directorate of Public Relations Monday said.