Tangshan city has extended production restrictions on 12 polluting industries and 206 enterprises from July until September to curb pollution in the province, according to Chinese media.
According to Tangshan City Air Quality Enhancement Plan for July under Tang Eco-Environmental Protection  No. 7-
- Everyday from 22:00pm to 8:00am the next day, the sintering process is required to reduce the thickness of the material layer and the speed of the machine.
- The output at night from the blast furnace is required to decrease by not less than 10pc, compared to the normal production levels.
- The steelmaking process would reduce the number of tapping furnaces according to the iron output along with transportation restrictions on heavy trucks during those hours.
- Additionally, ammonia escape concentration should not be higher than 2mg/m.