Environment Minister Sussan Ley is yet to see the latest greenhouse gas data, which has not been released by the federal government despite missing a Senate-imposed deadline.
The Senate passed a motion last October calling for greenhouse gas data to be released no later than five months after each quarter.
Last Friday was the due date for December's data but it remains nowhere to be seen.
Although reducing emissions now comes under the scope of Energy Minister Angus Taylor's portfolio, he and Ms Ley are the relevant ministers for the combined Department of Environment and Energy.
"I'm not going to encroach in minister Taylor's space, this is not a passing the buck exercise," Ms Ley told ABC's Radio National on Wednesday.
"No I haven't, I haven't," she said when asked if she's seen the latest numbers.
The government has come under criticism for the late release of the emissions data, with environmentalists suggesting it will show pollution has continued to rise under the coalition.
Mr Taylor was sworn into his new role last Wednesday, just days before the Senate publication deadline.
A spokeswoman from the Department of Environment and Energy told AAP in a statement the data is expected to be released this week.
