Air toxics National Environment Protection Measure (NEPM) monitoring investigation levels
| Pollutant | Averaging period | Monitoring investigation levels |
|---|---|---|
| Benzene | Annual | 3 ppb |
| Benzo(a)pyrene | Annual | 0.3 ng/m3 |
| Formaldehyde | 24 hours | 40 ppb |
| Toluene | 24 hours Annual |
1000 ppb 100 ppb |
| Xylene | 24 hours Annual |
250 ppb 200 ppb |
Annual: the annual average concentrations are the arithmetic mean concentrations of 24-hour monitoring results.
24 hours: monitoring over a 24-hour period is conducted from midnight to midnight.
ppb: parts per billion (for every one billion litres of air there is one litre of the pollutant)
ng/m3: nanograms per cubic metre (1 billionth of a gram per cubic metre)
Air quality summary
Saturday November 7 2009: No summary is available today.
Forecast: Good to Fair air quality is expected in Melbourne on Sunday