16 October 2025
Natural Environment’s Water and Air team in the department of Infrastructure and Environment
have produced a report on the 2024 results from the ongoing air quality monitoring programme
in Jersey, in conjunction with Air consultants Ricardo Ltd.
The air quality monitoring programme in Jersey during 2024 consisted of the following:
- Automatic monitoring of nitrogen dioxide (NO2): Automatic monitoring of NO2
concentrations is carried out at Beresford Street, where monitoring started in 2021.
- Automatic monitoring of particulate matter (PM10 and PM2.5): Particulate matter was
monitored at three locations in 2024, Central Market, Howard Davis Park and Howard
Davis Farm. In June 2024, the Osiris monitor located at Howard Davis Park was
relocated to Howard Davis Farm.
- Passive diffusion tube measurements for NO2 and hydrocarbons: Non-automatic
diffusion tube samplers were used for indicative monitoring of NO2 at 23 sites in
addition to 2 sites that were used temporarily to assist in the monitoring of pollutant
concentrations during the School Street Pilot Scheme that took place in 2023.
- A suite of four hydrocarbons (benzene, toluene, ethylbenzene and xylenes) at a further
five sites. Hydrocarbon monitoring sites included areas likely to be affected by specific
emission sources (such as a petrol station and a paint spraying process), as well as
general background locations.
The 2024 non-automatic monitoring programme has continued a long-term survey that has
operated in Jersey since 1997. In 2025, the particle Osiris monitors are planned to be replaced
with low-cost sensor units, and a new reference site is planned to be installed in Jersey, which
will include a reference PM analyser.
Since 2000, there is shown to be an overall decreasing trend in NO2 concentrations at long-running NO2 diffusion tube monitoring locations with reductions between 40-50% across sites.
This decrease is likely linked to increased vehicle efficiency and cleaner fuels as well as the
overall decline in the use of diesel vehicles in Jersey. A few sites showed small increases in
NO2 concentrations in 2023 which is likely due to the continued reuptake in travel following the
COVID-19 Pandemic restrictions imposed between 2020 and 2021.
However, in 2024, all
diffusion tube monitoring sites showed a decrease in concentrations in 2024 compared to
2023. Whilst the general trend is showing improvement, there are still pollution hotspots
resulting from traffic congestion, which can worsen in certain weather conditions.
Over the long term, hydrocarbon concentrations have generally decreased at all sites that have
been operational for 5 years or more.
Minister for the Environment, Deputy Steve Luce, said:
“This report highlights the continued progress Jersey is making in improving air quality, thanks to
long-term monitoring and targeted action. We remain committed to building on these results, in
line with the objectives set out in the Carbon Neutral Roadmap.”
For any queries relating to the report and Air quality monitoring in Jersey, please contact:
environment@gov.je or 01534 441600,
gov.je