tomorrow morning at the cincinnati open. jim. where you live could increase your risk of dementia later in life. people living in regions with air pollution linked specifically to wildfires in agriculture were more likely to develop dementia than people that didn't face that sem exposure. cnn medical correspondent meg tirrell has been following the story. particularly agriculture and not safe from factory emissions. why exactly? >> jim, this is one of the first studies that actually looked at these specific sources of exposure to this fine particulate matter. they did find the most robust connections between agriculture and wildfire, living in areas where there's pollution from those kinds of sources. in terms of agriculture, the theories include the fact that this is a source of ammonia, also the use of pesticides. that could potentially contribute to some of this

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