Predominant Pollen and Spores

Alder season can start from late March to mid-Apri and end mid to late June. The counts vary mostly from low to moderate with the occasional high. The alder season is highly sensitive to weather conditions. The highest counts occur from april to mid-June. They are usually considered important allergens.

This group of weeds are similar microscopically and are not differentiated. They include some weeds which are considered allergenic. Low and moderate counts are observed from mid-June to late September.

Ash pollen season can start from late April to mid-May and end late May to early June. Some years very high counts are observed but the season varies from year to yearin timing, season length and pollen levels. This is partially due to weather. Considered to be allergenic only in highly sensitized individuals.

The start and end of the birch season can vary by as much as a month which is due to the effect of weather. The start of the season can occur from late April to mid-May and the end can occur from late May to late June. The counts can get in the high range.

Cedars, junipers, and yews produce significant counts, mostly in the moderate range, with a few high counts. The season can start late March to mid-April and end late May to mid-June. Some high counts are observed. There is great fluctuation in the season due to the effect of weather. Probably of no significance in causing allergic reactions.

Elm are important allergens. The season can start from early April to early May and end late April to late May. There is a large fluctuation from year to year for the season length, timing of the season and the amount of pollen produced. This is partially due to the effect of weather.

Grasses produce significant counts, usually in the low and moderate ranges with the occasional high counts in June and July. The main season can start from mid to late May and end early to mid-October.

Hazelnuts produce low and moderate counts. The season can start from the second week of April to the second week of May and end mid to late May. The counts can be in the low to moderate range. May cause allergic reactions in individuals who are highly sensitized.

Maple season varies greatly which is mostly due to the effect of weather. Not only does the season start and end vary but the amount of pollen produced as well as the season length. The season can start from late April to mid-May and end mid to the end of May. Most years the counts are low and moderate. Occasionally a high count is observed.

Mugwort season is from mid-July to mid-October with low and moderate counts observed. Certain species are considered highly allergenic.

The mustard and cabbage family are responsible for contact dermatitis and food allergies. They are not considered important in airborne allergies since they are mostly insect pollinated but a significant amount of pollen is observed in our samples at this location. The season can start around late June and lasts until mid-September. Mostly low, with the occasional moderate, counts are observed.

Nettles and parietaria occur in significant numbers that may cause allergic reactions. The season is from mid-June to early September and the counts are in the low and moderate ranges.

Oak season can start from late April to the third week of May and end early to mid-June. Mostly low, with the occasional moderate, counts are observed. The timing of the season as well as to how much pollen is produced can vary a lot from year to year partially due to the effect of weather. Oaks are highly allergenic.

Very high counts are observed for pine, fir and spruce. The season can start early May to the third week of May and end mid to late July. There can almost be a month difference as to when the season can occur from year to year which is partially due to weather. This group is very important to those individuals who are sensitized.

Poplar, cottonwood and aspen season can start from early April to the end of April and end from early to late May. Some of the counts are very high and may cause allergic reactions.

Ragweed season is from late July to early October with only low counts observed.

Sagebrush season is from mid-July to mid-October with low and moderate counts observed. Certain species are considered highly allergenic.

Willows pollen season can start from mid-April to early May and end early to late June. There is a great variation in the season from year to year not only in when the season occurs but the amount of pollen produced. Some years very high counts are observed. Considered to cause allergic reactions in individuals who are sensitized.

Alternaria counts do get high and some species are known to cause allergic reactions. The season is from May to mid-October.

Aspergillus are found throughout the whole counting season and are probably present in significant numbers beyond that. Significant counts are observed from late March to late fall.

Boletus counts are sometimes very sporadic with some high counts observed. It may be of significance in causing allergic reactions. The season is from mid-June to the end of September.

Botrytis may be a significant allergen, and high counts are observed. The season is sporadic from late April to early October.

The season is sporadic from late March to early October. Allergenic properties are unknown.

Cladosporium is the most abundant spore found throughout the whole season. Some species are known to cause allergic reactions. This spore exists all year round but very high counts are known to occur from March to well into late fall.

Coprinus sp. can produce some very high counts from late May to mid-October. It is considered an important allergen.

Diatrypaceae counts are sporadic throughout the whole counting season. Very high counts can be observed from late March to mid-October. Not known to cause allergic reactions

The counts are mostly in the low range. This is a late summer and fall spore, July to early October. There are other related genera, which are also found in air samples that can cause respiratory problems. One example is Bipolaris sp.

Epicoccum species are known to cause allergic reactions. The season is from the end of April to mid-October with low and moderate counts observed.

Erysiphe, also know as powdery mildew, main season is from late April to mid-October. Low to high counts are observed.

Fusarium counts are very sporadic throughout the whole counting season. The majority of the season occurs from May to the end of September with low and moderate counts.

Ganoderma also known as bracket fungus can produce high counts from mid-June to early October. It is considered an important allergen.

Helicomyces season is from May to the end of September producing low to very high counts. The season is very sporadic. Allergenic properties are unknown.

Leptosphaeria season starts early April and ends mid-October. The counts vary from day to day, which is probably due to the effect of weather. Very high counts are observed from July to mid-October. This group is important for those individuals who are sensitized.

Low and moderate counts are observed from late March to mid-October. Some moderate and high counts are observed.

Penicillium are found throughout the whole counting season and are probably present in significant numbers beyond that. Significant counts are observed from late March to late fall.

Pithomyces season produces low to moderate counts, with a few high counts observed, from mid-June to the end of September. Allergenic properties are unknown.

The season occurs mostly from July to the end of September with occasional moderate counts observed.

Uredinales aka rusts do occur in high numbers but not enough is known about their significance in causing allergic reactions. The main season is from late May to mid-October.

Ustilaginales commonly referred to as smuts can reach high counts, but allergenic properties are unknown. The season is from mid-April to mid-October with some very high counts.