National has dropped in popularity following the latest government budget, with Labour picking up its lost ground, according to a new political poll.

The One News Colmar Brunton poll, released on Monday night, sees National down four points to 47 per cent, while Labour has risen four points to 33 per cent since the last poll in April.

The Greens rose two points to 13 per cent, while New Zealand First has dropped one point to just two per cent.

ACT, the Conservative Party, the Maori Party and Mana are all on one per cent.

In the personal popularity poll, Prime Minister John Key remained steady on 48 per cent, while Labour leader David Shearer rose three points to 14 per cent.

The poll was taken in the week following the government's May 24 budget, which prompted protests from students and teachers over changes to tertiary education funding and increased class sizes in schools.

It also follows unpopular government decisions, such as the sale of the Crafar farms to a Chinese buyer, and the ACC scandal which claimed former minister Nick Smith.

However, Labour hasn't been without its own troubles, with senior MP Shane Jones stood down while the auditor-general investigates the process he followed in granting citizenship to a fraud-accused Chinese businessman in 2008.