| Fuel/material | Minimum frequency of analyses |
|---|
| Natural gas | At least weekly |
| Process gas (refinery mixed gas, coke oven gas, blast-furnace gas and convertor gas) | At least daily — using appropriate procedures at different parts of the day |
| Fuel oil | Every 20 000 tonnes and at least six times a year |
| Coal, coking coal, petroleum coke | Every 20 000 tonnes and at least six times a year |
| Solid waste (pure fossil or mixed biomass fossil) | Every 5 000 tonnes and at least four times a year |
| Liquid waste | Every 10 000 tonnes and at least four times a year |
| Carbonate minerals (including limestone and dolomite) | Every 50 000 tonnes and at least four times a year |
| Clays and shales | Amounts of material corresponding to 50 000 tonnes of CO2 and at least four times a year |
| Other input and output streams in the mass balance (not applicable for fuels or reducing agents) | Every 20 000 tonnes and at least once every month |
| Other materials | Depending on the type of material and the variation, amounts of material corresponding to 50 000 tonnes of CO2 and at least four times a year |
