The current data snapshot and forecast levels do not always coincide, for various reasons. Forecasting air quality is an inexact science,
even more so than forecasting the weather! Measurement data is very localised, and can be affected by factors specific to
the measuring sites. Forecasts are for the maximum levels expected during the day, and not all locations may reach the peak at the
Forecasts are published at 6am every day. If you view this site earlier in the morning, forecasts for "today" will still be yesterday,
and "tomorrow" will be today.