FREEDOM OF SPEECH
If nuclear power plants go into melt down because of an attack that shuts down the plants then that resulting radiation does not stay in place.I believe usually the likely warring parties are in the northern hemisphere and will leave the southern hemisphere intact.
I was very interested when Fukushima had it's disaster in 2011. I found an online site that was tracking the radiation cloud as it circled Earth over and over again on the jet stream. Depending where there were storms/strong winds particulate was released in different parts of the globe and that site registered the percentage of fallout in different areas.. Later in my area, weeds that were normally less than a foot high started growing 5 feet high with deformed flowers. This year those plants just are gone in that field because they could not produce viable seeds
So regardless of how far away from the attack site a person may be, that radiation travels with the wind over vast distances and could settle anywhere.
This is why the Bible tells us this in Mark chapter 13,
15 And let him that is on the housetop not go down into the house, neither enter therein, to take any thing out of his house: 16And let him that is in the field not turn back again for to take up his garment. 17But woe to them that are with child, and to them that give suck in those days! 18And pray ye that your flight be not in the winter. 19For in those days shall be affliction, such as was not from the beginning of the creation which God created unto this time, neither shall be. '
Pregnant women will fear their fetus will be affected by the radiation, their baby will be born deformed and she will be without resources to help her child. Young children are more susceptible to radiation than adults as it takes a smaller amount of it to damage their DNA. People will flee areas of fallout and battlegrounds.
Why pray not in winter? Because Nuclear Winter is the complete end of war as the affliction of it, the pain and suffering is immeasurable and greater than humans have ever experienced on planet Earth. Nuclear battle will resume even as the temperature around the globe starts to rapidly drop.
"Neither shall be" because it is an extinction event of Homo Sapiens as the oceans will freeze solid