How do changes in land use and agriculture affect the distribution of Crested Wheatgrass and its pollen?

Changes in land use and agriculture can significantly influence the distribution of Crested Wheatgrass and its pollen, thereby affecting those with pollen allergies. For instance, if land once used for other crops is converted into Crested Wheatgrass fields, the pollen exposure in that region would increase, possibly intensifying allergies during the grass's pollination period.

Similarly, changes in agricultural practices like irrigation or pest management can affect grass growth and consequently, pollen production. More efficient irrigation might result in more robust growth, whereas heavy pesticide use could stunt it. Therefore, these shifts can modify pollen concentrations in the atmosphere, leading to changes in the severity and frequency of allergic reactions.

Deforestation and urban expansion may also contribute to pollen distribution changes. Any decrease in diverse vegetation can create more space for wind-pollinated plants like Crested Wheatgrass to proliferate. Therefore, those living in urban areas may have more exposure to this allergen.

As for allergy pills, they work by blocking the immune response to pollen, reducing symptomatic effects. While they can't prevent exposure, they're effective in managing symptoms, including sneezing, congestion, and itchy eyes. Varieties of over-the-counter and prescription allergy medications are available for pollen allergies, including antihistamines, decongestants, nasal corticosteroids, and leukotriene modifiers.

Remember, consulting a healthcare professional is crucial to determine the best treatment plan based on your symptoms, frequency, and severity of allergic reactions. They can help you navigate the impacts of changes in local vegetation and allergen distribution on your health.