Bay of Plenty Times
  • Bay of Plenty Times home
  • Latest news
  • Business
  • Opinion
  • Lifestyle
  • Property
  • Sport
  • Video
  • Death notices
  • Classifieds

Subscriptions

  • Herald Premium
  • Viva Premium
  • The Listener
  • BusinessDesk

Sections

  • Latest news
  • On The Up
  • Business
  • Opinion
  • Lifestyle
  • Property
    • All Property
    • Residential property listings
  • Rural
    • All Rural
    • Dairy farming
    • Sheep & beef farming
    • Horticulture
    • Animal health
    • Rural business
    • Rural life
    • Rural technology
  • Sport

Locations

  • Coromandel & Hauraki
  • Katikati
  • Tauranga
  • Mount Maunganui
  • Pāpāmoa
  • Te Puke
  • Whakatāne
  • Rotorua

Media

  • Video
  • Photo galleries
  • Today's Paper - E-Editions
  • Photo sales
  • Classifieds

Weather

  • Thames
  • Tauranga
  • Whakatāne
  • Rotorua

NZME Network

  • Advertise with NZME
  • OneRoof
  • Driven Car Guide
  • BusinessDesk
  • Newstalk ZB
  • Sunlive
  • ZM
  • The Hits
  • Coast
  • Radio Hauraki
  • The Alternative Commentary Collective
  • Gold
  • Flava
  • iHeart Radio
  • Hokonui
  • Radio Wanaka
  • iHeartCountry New Zealand
  • Restaurant Hub
  • NZME Events

SubscribeSign In
Advertisement
Advertise with NZME.
Home / Bay of Plenty Times

Clean air of lockdown gone: Waikato Regional Council

Bay of Plenty Times
12 Jun, 2020 04:05 AM3 mins to read

Subscribe to listen

Access to Herald Premium articles require a Premium subscription. Subscribe now to listen.
Already a subscriber?  Sign in here

Listening to articles is free for open-access content—explore other articles or learn more about text-to-speech.
‌
Save

    Share this article

Coastal News Editor Alison Smith in Mercury Energy's electric classic car, Evie in 2018. PHOTO/Coastal News.

Coastal News Editor Alison Smith in Mercury Energy's electric classic car, Evie in 2018. PHOTO/Coastal News.

The improved air quality of the Covid-19 lockdown has gone.

The most recent Waikato Regional Council monitoring results show a return to normal concentrations.

For Waikato Regional Council chairman Russ Rimmington, the lockdown results demonstrate that a move to low-emission vehicles will make "a huge difference" to air quality.

"It also shows that our continued support and encouragement for industry to improve their emissions controls is quite justified when it comes to the health of our people and environment."

The council monitors air quality in airsheds in Hamilton, Tokoroa, Te Kūiti, Taupō, Putaruru, Morrinsville and Thames.

Advertisement
Advertise with NZME.
Advertisement
Advertise with NZME.

Improvement in air quality (PM10 levels) was seen in three out of the seven airsheds over the Covid-19 Alert Level 4 lockdown period.

A 21 per cent PM10 reduction in Hamilton and 11 per cent drop in Morrinsville is likely because of a reduction in emissions from traffic and also potentially a reduction in emissions from industry, according to council scientists. The average PM10 concentrations in both towns over levels 3 and 2 are back to expected levels for this time of year.

Te Kūiti's PM10 concentrations dropped 32 per cent during the lockdown, probably because of a reduction in industry emissions and a minor contribution from less traffic. The average PM10 concentrations over combined levels 3 and 2 are back to normal.

Advertisement
Advertise with NZME.

No statistically significant changes in PM10 concentrations were observed at the other airsheds.

Council senior scientist Jonathan Caldwell said the results could have been different had lockdown been during winter.

"With people spending more time inside and temperatures starting to cool towards the end of lockdown, woodburner use was increasing, which can confound the assessment of the impact of a reduction in traffic emissions."

Caldwell compared average PM10 concentrations in all seven airsheds over level 4 lockdown with the 33-day average for the same period over the past four years. He then did the same for the 33 days spent in levels 3 and 2.

"This is a more valid approach than comparing air quality directly prior to lockdown with air quality during lockdown, as air quality can be very variable from one day to the next. This is due to differences in meteorology such as air temperature and wind speed and also differences in emissions from vehicles during a public holiday, for example.

"In New Zealand, air quality varies strongly with season, with the worst air quality experienced during the winter months when it gets colder and we experience more calm inversion type conditions coupled with a big increase in the number of woodburners operating," Caldwell said.

Save

    Share this article

Latest from Bay of Plenty Times

Bay of Plenty Times

'God-given right': Family defends largely unconsented homestead on rural land

04 Jul 08:45 PM
Bay of Plenty Times

'I'm proud of you': Sister's final message before fatal crash

04 Jul 06:03 PM
Bay of Plenty Times

Farmer's harrowing hours crushed beneath tractor

04 Jul 02:00 AM

There’s more to Hawai‘i than beaches and buffets – here’s how to see it differently

sponsored
Advertisement
Advertise with NZME.

Latest from Bay of Plenty Times

'God-given right': Family defends largely unconsented homestead on rural land

'God-given right': Family defends largely unconsented homestead on rural land

04 Jul 08:45 PM

A family wanted to be left alone to develop their land without council interference.

'I'm proud of you': Sister's final message before fatal crash

'I'm proud of you': Sister's final message before fatal crash

04 Jul 06:03 PM
Farmer's harrowing hours crushed beneath tractor

Farmer's harrowing hours crushed beneath tractor

04 Jul 02:00 AM
Farmer's harrowing hours crushed beneath tractor

Farmer's harrowing hours crushed beneath tractor

From early mornings to easy living
sponsored

From early mornings to easy living

NZ Herald
  • About NZ Herald
  • Meet the journalists
  • Newsletters
  • Classifieds
  • Help & support
  • Contact us
  • House rules
  • Privacy Policy
  • Terms of use
  • Competition terms & conditions
  • Our use of AI
Subscriber Services
  • Bay of Plenty Times e-edition
  • Manage your print subscription
  • Manage your digital subscription
  • Subscribe to Herald Premium
  • Subscribe to the Bay of Plenty Times
  • Gift a subscription
  • Subscriber FAQs
  • Subscription terms & conditions
  • Promotions and subscriber benefits
NZME Network
  • Bay of Plenty Times
  • The New Zealand Herald
  • The Northland Age
  • The Northern Advocate
  • Waikato Herald
  • Rotorua Daily Post
  • Hawke's Bay Today
  • Whanganui Chronicle
  • Viva
  • NZ Listener
  • Newstalk ZB
  • BusinessDesk
  • OneRoof
  • Driven Car Guide
  • iHeart Radio
  • Restaurant Hub
NZME
  • About NZME
  • NZME careers
  • Advertise with NZME
  • Digital self-service advertising
  • Book your classified ad
  • Photo sales
  • NZME Events
  • © Copyright 2025 NZME Publishing Limited
TOP