The charts below show the average particulate and gas readings collected by the monitoring stations. Measurements are recorded at regular intervals throughout the day. You can select a date range to look at how levels change over time.


Data downloaded from this website has been collected automatically from the monitoring sites and has not yet been validated. Therefore, following validation this data may be subject to revision. Sharp spikes should be treated cautiously and may be the result of a calibration or a monitor malfunction.

When using this data you must comply to the terms described in the Creative Commons Attribution licence.

Caution should be applied when comparing data from different monitoring sites. Some monitoring sites are roadside locations while others are background locations or rural locations. Background sites generally represent overall area-wide exposure more closely than roadside sites.