Poor ventilation in buildings poses health risk

But one small change could make a big difference

Many buildings in New Zealand have poor ventilation, increasing the risk of airborne illness and indoor air pollution, new research shows.

The research, conducted by New Zealand’s top air quality scientists, measured carbon dioxide (CO₂) levels in 31 buildings – including schools, aged care centres, gyms, and offices – in Auckland, Christchurch and Otago. It showed that many indoor spaces did not get enough fresh air.

Gyms and education spaces were often the most poorly ventilated, while offices and churches tended to have better air quality.

Why?

Air Quality Collective scientist Ian Longley says it’s simple – windows and doors were opened more frequently in offices and churches.

“What struck us (from the experience of going to a range of centres to assess and improve ventilation) was how easy, in principle, it was to dramatically improve air quality.

“Making a small change – like opening doors and windows more often – can reduce the risk of infection, or reduce indoor pollutants which can trigger reactions, without expensive upgrades.”

Asthma and Respiratory Foundation NZ Chief Executive Ms Letitia Harding says it is clear from this research there are easy, cost-effective ways to help circulate fresh air to reduce respiratory flare-ups.

“There’s a common misconception that improving air quality requires expensive technology, when in fact, something as simple as opening a window more often can make a huge difference.”

This research is particularly important for those living with respiratory conditions, Ms Harding says.

“For the one in five Kiwis living with a respiratory disease, poor air quality can contribute to flare-ups.

“We need to ensure that people with asthma, COPD, and other respiratory conditions can safely enter any indoor space without fear of triggering symptoms.”

This research was conducted to inform the Government's approach to pandemic preparedness.

The Collective was concerned that too little is being done, to not only prepare for the next pandemic, but also to protect long COVID victims and to enable sensitive individuals to enter any building confident that the air won’t trigger or worsen their symptoms or condition.

The Asthma and Respiratory Foundation NZ has partnered with The Air Quality Collective – New Zealand’s only dedicated air quality research and monitoring organisation. This collaboration will ensure better access to air quality data, raise awareness about the impact of pollution on respiratory health, and advocate for improvements that benefit all New Zealanders.