radiation increasing

I was looking at the nuclear radiation map. Well, caught a bit of a scare. There is in Colorado a high of 75 counts per minute and rising. 100 is seen as alert level for us. Normal background radiation is 5-15 counts per minute approx. Folks, we have a situation that could turn serious. Right now even as we speak, radiation levels are going up. As to what is the major cause or reason. Well, we are not so sure.