![]() The pollen symbol shows the level of pollen in the air. If you have a condition that puts you at risk from higher levels of pollution, please see our advice. This means that there may be areas in the region with higher or lower levels of pollution than the average. The data shows average pollution levels for regions of the country. This is taken from 'Daily Air Quality Index' defined by Defra, which is shows average concentration of pollution over a period of time. The air pollution symbol shows the level of air pollution from pollutants such as sulphur dioxide, nitrogen oxides and particulate matter. This means that you may see this moment at a slightly different time from the forecast. These equations come from the Global Monitoring Laboratory. We use mathematical equations to work out the time of sunrise and sunset.
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