SARGODHA  -  The environmental protection department sealed six stone crushing units for violating smog laws here on Tuesday. According to official sources, the EPD team inspected various stone crushing units and sealed six ones, including Arain Brothers Stone Crusher, Saif Stone Crusher, Shalimar Stone Crusher Chak No 110 SB, Mazhar Khan Stone Crusher, Hassan Stone Crusher and Tasdaq Stone Crusher Chak No 113 SB.