Current Season vs Historical Data

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This graph shows how the last five counts this year compare to historical values. This graph does not show any information about whether the severity a count is high or low, but rather how the count compares to what you might expect for a given day during the season. Though this graph may appear simple, quite a lot of calculation is required to display it. This graph uses statistical analysis of 24 years of data to categorize the daily historical average levels of each count type and compare it to the relative level of the counts for each day this season!

In the case of a zero count and a zero average (such as weed pollen out of season), a faint line near the average is shown for that category. If a count type is not available for a given day (i.e. no mold count one day), then no line or bar appears for that day.

Graph of Average Pollen Seasons

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This graph shows average counts for trees, grasses, weeds, and molds throughout the season. The data point for each day is calculated as a multi-day rolling average using daily average values from data going back to 1995 for pollen counts and 2004 for mold counts. The pollen units of grains per cubic meter are shown on the left vertical axis for trees, grasses, and weeds, and the mold units of spores per cubic meter are displayed on the right vertical axis.

Individual count types can be disabled or re‐enabled by clicking the count type in the legend at the top of the graph. The graph will rescale automatically based on which counts are enabled.

Graph of Tree Pollen Seasons

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This graph shows the full tree pollen season for each of the past four years. Since counts are not always performed on weekends, each data point is a multiple day rolling average to prevent the graph from varying in a way that is not meaningful. Broken lines indicate that counting started late or stopped early during that season.

Individual years can be disabled or re‐enabled by clicking the year in the legend at the top of the graph.

Graph of Grass Pollen Seasons

The Pollen Explorer works best on a device with a larger screen

This graph shows the full grass pollen season for each of the past four years. Since counts are not always performed on weekends, each data point is a multiple day rolling average to prevent the graph from varying in a way that is not meaningful. Broken lines indicate that counting started late or stopped early during that season.

Individual years can be disabled or re‐enabled by clicking the year in the legend at the top of the graph.

Graph of Weed Pollen Seasons

The Pollen Explorer works best on a device with a larger screen

This graph shows the full weed pollen season for each of the past four years. Since counts are not always performed on weekends, each data point is a multiple day rolling average to prevent the graph from varying in a way that is not meaningful. Broken lines indicate that counting started late or stopped early during that season.

Individual years can be disabled or re‐enabled by clicking the year in the legend at the top of the graph.

Graph of Mold Seasons

The Pollen Explorer works best on a device with a larger screen

This graph shows the full mold pollen season for each of the past four years. Since counts are not always performed on weekends, each data point is a multiple day rolling average to prevent the graph from varying in a way that is not meaningful. Broken lines indicate that counting started late or stopped early during that season.

Individual years can be disabled or re‐enabled by clicking the year in the legend at the top of the graph.
© 2003-2019 Allergy, Asthma & Sinus Center, S.C. Pollen counts are made available as a public service without restriction for non-commercial use. Publishers, media and academic organizations may use pollen counts and related information free of charge, but attribution to the Allergy, Asthma & Sinus Center is required.