Ventilation standards must be improved at workplaces and N95 masks or similar face coverings should be distributed for free, the Green Party says.
Prime Minister Jacinda Ardern confirmed the country will enter the red traffic light setting at 11.59pm in response to community cases of the highly transmissible Omicron Covid-19 strain.
Political parties have weighed in after this morning's urgent press conference in the Beehive, where Ardern announced the new settings.
High-quality masks should be freely available for people most vulnerable to Omicron, including those interacting with the public as part of their job, Dr Elizabeth Kerekere said.
Kerekere, the Greens' Covid-19 spokeswoman, said rapid antigen tests (RATs) should be distributed as a screening tool to people most at risk of catching Omicron.
The Green Party also said Māori and Pacific providers should be prioritised in the rollout of booster shots and vaccination to children.
Kerekere also said indoor gathering limits should be reviewed.
If vaccine passes are used, private gatherings can hold up to 100 people in the red traffic light setting.
The same number of people can attend other venues, but must adhere to 1m physical distancing.
The PM said these limits would impact or force the cancellation of some events - including her wedding to fiancée Clarke Gayford.
The Act party today said confirmation of Omicron's community spread showed the Government's approach to managed isolation had been haphazard and pointless.
"Had people been able to self-isolate from Monday 17 January, it would have made no difference to the arrival of Omicron in New Zealand," Act leader David Seymour said.
"The Government says that continuing MIQ for another five weeks will stop the 'seeding' of new cases."
But Seymour said that would make little difference to the spread of Omicron.
"It certainly won't justify the misery it imposes on the team of six million."
He said the Government had no measurement or reporting on who was most vulnerable to Omicron, and whether those people had been boosted.
National Party leader Chris Luxon said rest homes, retirement villages and at-risk communities must be flooded with boosters if New Zealand is to withstand Omicron.
Luxon called for a big increase in the availability of RATs, and an upgrade of intensive care units.
"The Government can't afford to rest on their laurels any longer," Luxon said earlier today.
"They must implement a proper plan for Omicron and deliver on it."
He said the arrival of last year's Delta variant was foreshadowed for a long time, and New Zealand was unprepared then.
Auckland was subjected to a lockdown for almost four months during the Delta era.
Luxon said in a similar way, the country was unprepared for Omicron now.
"We're trying to bide time, yet again."