Atmospheric pollen count in Monterrey, Mexico

Abstract

There are few reports of pollen count and identification in Mexico; therefore, it is important to generate more information on the subject. This study was designed to describe the prevalence of pollen in the city of Monterrey, Mexico, during the year 2004. Atmospheric pollen was collected with a Hirst air sampler, with an airflow of 10 L/minute during 2004. Pollen was identified with light microscopy; the average monthly pollen count as well as total was calculated from January 2004 to January 2005. The months with the highest concentration of pollen were February and March (289 and 142 grains/m(3) per day, respectively), and July and November had the lowest concentration (20 and 11 grains/m(3) per day, respectively). Most of the pollen recollected corresponded to tree pollen (72%). Fraxinus spp had the highest concentration during the year (19 grains/m(3) per day; 27.5% of the total concentration of pollen). Tree pollen predominated from January through March; with Fraxinus spp, Morus spp, Celtis spp, Cupressus spp, and Pinus spp as the most important. Weed pollen predominated in May, June, and December and the most frequently identified, were Amaranthaceae/Chenopodiaceae, Ambrosia spp, and Parietaria spp. The highest concentration of grass pollen was reported during the months of May, June, September, October, and December with Gramineae/Poaceae predominating. Tree pollen was the most abundant during the year, with the ash tree having the highest concentration. Weed and grass pollen were perennial with peaks during the year.

Atopy, allergen sensitization and development of hypersensitivity reactions to paclitaxel

“…Nevertheless, Junglans rupestris is a tree frequently found in the northeast of Mexico whose pollen is detected mainly in spring, 31 which could explain its high positive sensitization in our study's population. Similarly, according to the most recent data from food allergen sensitization, peanut and hazelnut were the 2 nd and 4 th most frequently food allergens found in a study conducted in the northeast of Mexico as well.…”

Species and quantity of airborne pollens in Shanghai as monitored by gravitational and volumetric methods

“…The total pollen counts detected by the two methods were significantly correlated (r=0.622, P<0.05) (Figure 3). predominant in Monterey in Mexico, 19 and account for 72% of the total pollen count, peaking from January to March, of which Fraxinus is the most abundant. Chenopodiaceae/ Amaranthaceae, ragweed and pellitory are the main grass pollen species, and are found throughout the year, but are predominant in May, June and December.…”

Airborne Pollen Calendar of Toluca City, Mexico

“…Despite the fact that the first record on atmospheric pollens in Mexico was carried out in 1949 for Salazar-Mallen [13], and several aeropollinic studies have been developed [14][15][16][17][18][19][20][21][22][23][24][25], only two pollen calendars have been elaborated, both for Mexico City [26,27]. Because pollen allergies display geographic variability, influenced by bioclimatic conditions and allergenic plants distribution [28], it is crucial to develop pollen calendars for each specific city in order to carry out a regional clinical management.…”