NITROGEN DIOXIDE?
The oxides of nitrogen (referred to collectively as NOx) comprise several gases, including nitric oxide (NO) and nitrogen dioxide (NO2). In the ambient air, NO2 is probably the most important for human health, so that data on health risks and guidelines are usually expressed in terms of NO2 rather than NOx.

Sources of NITROGEN DIOXIDE
Nitrogen dioxide is produced both directly as a primary and indirectly as a secondary pollutant.  In the UK, some 50% of the atmospheric nitrogen dioxide is produced by motor vehicles and 25% by power stations. Although it is mainly a secondary air pollutant, nitrogen dioxide is rapidly formed close to sources of nitric oxide.
Concentrations of nitrogen dioxide in urban areas show a distinct diurnal variation with peak levels typically being recorded during the morning and evening rush hours. In cold, still weather, concentrations may increase due to trapping of pollutants in a layer of cold air close to the ground

Where are the levels of NITROGEN DIOXIDE measured ?
Basildon Council has a roadside monitoring station based at Gloucester Park. It is sited on Uppermayne - one of the busiest roadways in the district.

How often are the levels of NITROGEN DIOXIDE recorded?
The monitoring station records the levels of PARTICULATE MATTER (PM10) DUST at 15 minute intervals, 24 hours a day, 365 days a year. The air quality chart is updated every hour.

What are the effects of NITROGEN DIOXIDE ?
Young children and people with asthma have been identified as sensitive groups who may be affected during high nitrogen dioxide pollution incidents. Individuals with chronic bronchitis, emphysema or other chronic respiratory diseases may also be sensitive to nitrogen dioxide exposure. This has not been proven however, and various studies have generally remained inconclusive as to the existence of a direct causal link.

Todays Measurements of NITROGEN DIOXIDE