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Average Forecasted Grass Pollen Index (May-August 2024): 2.4 | Rank: 56 Historical Wind Speed (May-August 2020): 8.3 mph | Rank: 111 Average Number of Significant Grass Allergens: 16 | Rank: 1
A pollen count is a measurement of the number of pollen grains in a given volume of air. Pollen counts, and forecasts of pollen conditions, are routinely produced and reported to the public because high aerial pollen concentration is associated with increased rates of allergic reaction for those with conditions such as hay fever and asthma .
The study evaluated 197 cities in the U.S. and revealed that a warming climate results in more freeze-free days each year, which gives plants more time to grow and release allergy-inducing pollen.
Pollen allergy seasons can be very different depending on where in the U.S. you are. Here are the 10 best and worst cities for people with allergies.
The pollen source in a given area depends on the type of vegetation present and the length of their bloom period. What type of vegetation will grow in an area depends on soil texture, soil pH , soil drainage, daily maximum and minimum temperatures, precipitation, extreme minimum winter temperature, and growing degree days .
The January 2024 version of the WHO database contains results of ambient (outdoor) air pollution monitoring from almost 5,390 towns and cities in 63 countries. Air quality in the database is represented by the annual mean concentration of particulate matter ( PM10 and PM2.5, i.e. particles smaller than 10 or 2.5 micrometers, respectively).
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Here's the setup. High pressure will move from Tennessee to offshore overnight. The Cape Fear region will see brisk northwest winds today, giving way to a warmer flow by mid-week.