Air pollution

Hertfordshire and Bedfordshire air pollution and monitoring network

In 1999 the Hertfordshire and Bedfordshire Air Pollution Monitoring Network was set up to co-ordinate the monitoring and reporting of air quality across the two counties. It was developed by the local authorities and Kings College London.

The network includes data from the networks 11 real-time analysers and more than 250 diffusion tubes and interpretation of the data. The network website can be found at www.hertsbedsair.org.uk.

The site includes daily, weekly, monthly data and the networks annual reports.

Click here for the Air quality review and assessment - detailed assessment 2008

Continuous air quality monitoring station at Fleetwood, St Albans

Air quality is now measured every minute of every day at the Councils monitoring station in Fleetville, St Albans. The following pollutants are measured at the site:

• Particulates (small smoke particles) (PM10)

• Nitrogen dioxide (NO2)

• Ozone (O3)

• Carbon Monoxide (CO)

• Sulphur Dioxide (SO2)

Passive diffusion tube monitoring

The department has more than 30 monitoring sites to measure nitrogen dioxide levels across the district. Results are given for monthly periods and can be viewed by going to http://www.hertsbedsair.org.uk/hertsbeds/asp/DiffusionTubes.asp?dt=

(this site contains data for other Councils in Hertfordshire and Bedfordshire)

Data for the following sites is available:

Nitrogen dioxide

Nitrogen Dioxide is of potential concern to human health. At relatively low levels it can cause breathing difficulties and throat and eye irritation. At high concentrations more severe health effects may occur such as bronchitis. Nationally the two main sources of nitrogen dioxide are motor vehicles and power stations.

Air quality management

The Environment Act 1995 requires local authorities to regularly review and assess the quality of air within their areas, and to determine whether or not the air quality objectives are likely to be achieved.  Where exceedences are considered likely, the local authority must then declare an Air Quality Management Area (AQMA) and prepare an Air Quality Action Plan (AQAP) setting out the measures it intends to put in place in pursuit of the objectives.

There are currently 3 AQMAs in effect in the St Albans District Council area, all of which exhibit mean NO2 concentrations in 2008 which exceed the annual average Air Quality Objective (40µg·m-3). Monitoring of NO2 throughout the district is done by means of diffusion tubes at 37 sites, mostly within the City of St Albans. In 2008, 11 sites recorded NO2 concentrations above the annual mean objective limit for NO2, 2 of which indicate that the site may require a Detailed Assessment.

Measured concentrations of NO2 at SA120 and SA121 indicate that the annual mean objective for NO2 is exceeded in locations of relevant exposure in the vicinities of Mount Drive and Sleapcross Gardens. It is therefore recommended that St Albans District Council proceed to a Detailed Assessment for NO2 at these two locations.

St Albans City and District Council identified two narrow congested streets, at Watson’s Walk and Lattimore Road, off London Road in the City Centre, east of the existing AQMA at the junction with Holywell Hill. Since it has been established by the Council that there is no relevant exposure in Watson’s Walk, it is recommended that a Detailed Assessment of NO2 from road traffic in the Lattimore Road area be carried out.

The air quality action plan is a working document, therefore, if you would like to view the most up to date version please contact: environmental@stalbans.gov.uk

• USA Report StAlbans 2009.pdf (PDF - 663 kb)
• Air quality review and assessment - detailed assessment 2008 (PDF - 5 mb)
• Air quality updating and screening assessment - July 2006 (PDF - 3 mb)
• Air quality annual progress report 2005 (PDF - 437 kb)
• Air quality review and assessment 2004 (PDF - 696 kb)
• Air quality review and assessment - stage 4 - January 2003 (PDF - 1 mb)
• Air quality action plan - December 2003 (PDF - 434 kb)
• Action plan (PDF - 349 kb)