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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 29 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!
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.
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.
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.
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.
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.