To teach my children that this happens, I did a simple test with a aluminized mylar emergency sleeping bag (outgassed over 6 months).
1. Wearing a cellphone in the off position and standing put the sleeping bag over your body.
2. Make sure you can safely get used to it (acclimate) for 10 minutes-otherwise stop and take it off
3. Now turn on the phone-Do you start to feel things are different? Are you now able to get used to it (acclimate)?
4. I have 5 children they all had to take the sleeping bag off in less than 1 minute into step 3.
5. All 5/5 experienced classic EHS symptomatology only after turning on the cell phone (step 3).