Air pollution levels recorded on
Monday 6 September 2010, 05:00-06:00BST
view the Government's health advice for each band/index
How are the bands calculated?
Latest network hourly pollution bulletin
This map shows the latest hourly readings downloaded from network pollution analysers. Not all analysers on the network are contacted every hour, so some sites may show 'no data'. Data have undergone automatic validity checks.

Hertsmere - Borehamwood

Nitrogen Dioxide:

 view the Government's health advice for this level of air pollution

Ozone:

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PM10 Particulate:

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More Information for Hertsmere - Borehamwood:
Monitoring site details       This week's graph       Annual statistics
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