Is it dangerous to live near power towers or high voltage power lines?

Power lines emit large magnetic fields, which can be measured in milligauss (mG) using what's called a gaussmeter. The Trifield TF2 set in the Magnetic mode is a classic example of a meter which can measure this.

The Cemprotec 33 meter which is the #1 meter I recommend for beginners can also measure magnetic fields: https://theshieldingshop.com/product/cemprotec-33-meter/ref/4503 (Coupon EMFGUY for 10% off)

If you live close to a power substation or power lines (especially very large high voltage power lines), it's important to measure your environment and make sure that levels of magnetic fields are under 0.5 mG in your front yard. If they are above that, the magnetic fields levels are considered too high on a Building Biology standpoint.

The risks of living in such an environment for an extended period of time might include an increase risk of cancers, including childhood leukemia, but also a reduction in sleep quality and overall wellness. You can read more about the science here: https://ehtrust.org/science/research-on-magnetic-fields-extremely-low-frequency-electromagnetic-fields-cancer-and-miscarriage/

If you think the levels of magnetic fields are too high in your home due to the presence of power lines, I suggest double checking these results with the help of a qualified EMF mitigation specialist, such as the incredible team over at Shielded Healing (https://shieldedhealing.com?aff=14).