About to purchase 10 acres in missouri

I'm so excited! I've been studying everything I can from earthbag construction to gardening for years now... And finally about to take the leap I see many others here from missouri, I'm looking at 10 acres in south east dent county and I just read on city-data that bunker (a near by town) has had high unusually high lead air pollution... What does that mean and should I reconsider the area?