The Sydney Pollen App provides pollen forecasts generated using real-world pollen count data collected from our monitoring network. It provides a year-round 10 day forecast of grass pollen levels in Sydney, Australia. We advise users of predicted high pollen days with push notifications and users can tell us how they are feeling via our hay fever symptom survey. Information collected by the survey help us better understand the relationship between our pollen count and how pollen is affecting the community.