# Direct answers > Frequently asked EMF questions with short, cited, quotable answers linked to the underlying records. - Canonical URL: https://emfbase.com/questions - JSON: https://emfbase.com/api/questions - CSV export: https://emfbase.com/export/questions.csv - Records: 36 ## Records - [Are exposure limits based only on heating?](https://emfbase.com/questions/are-emf-limits-based-only-on-heating): Yes: limits derive from thermal and nerve-stimulation thresholds divided by a safety factor. Whether sub-thermal effects exist is the open dispute. - [Are smart meters dangerous?](https://emfbase.com/questions/are-smart-meters-dangerous): Peak bursts are high but duty cycle is under 1%, so time-averaged exposure is far below limits. Room layout and the utility's own filings are the practical levers. - [Can you object to a tower or refuse a smart meter?](https://emfbase.com/questions/can-i-refuse-a-cell-tower-or-smart-meter) *(provisional)*: U.S. law bars local RF-emission objections to compliant facilities; planning grounds remain. Smart-meter opt-outs exist at state/utility level, often for a fee. - [Can you shield a magnetic field?](https://emfbase.com/questions/can-you-shield-magnetic-fields): Almost no common material blocks ELF magnetic fields; mu-metal gives a factor of 2–5 at high cost. Distance and source correction are the real options. - [Did Italy raise its EMF limit from 6 to 15 V/m?](https://emfbase.com/questions/did-italy-raise-its-emf-limit-to-15-v-m): Yes — the attention value and quality objective went from 6 V/m to 15 V/m on 30 April 2024 under Law 214/2023; the 20 V/m exposure limit is unchanged. - [Do EMF protection stickers, pendants and harmonisers work?](https://emfbase.com/questions/do-emf-protection-devices-work): No — nothing passive of that kind changes a meter reading, and a phone sticker that did block signal would make the phone transmit harder. - [Do I need an accredited measurement to challenge a cell tower?](https://emfbase.com/questions/do-i-need-an-accredited-measurement): Regulators act on measurements made by the prescribed method by an accredited body (in Switzerland, an ISO/IEC 17025 firm in the SAS register). Your own readings are for triage, not for compliance. - [Does a low-SAR phone matter?](https://emfbase.com/questions/what-is-sar-and-does-a-low-sar-phone-matter): SAR is a worst-case compliance figure; usage habits change real exposure far more than choosing between compliant models. U.S. 1 g and ICNIRP 10 g values are not comparable. - [Does EMF cause cancer?](https://emfbase.com/questions/does-emf-cause-cancer): Not established. Both RF and ELF are IARC Group 2B on limited evidence; animal studies found rare tumours, and the 2024 WHO human review found no association. - [Does EMF shielding paint work?](https://emfbase.com/questions/does-emf-shielding-paint-work): Yes for RF, 30–40 dB on datasheets, but windows dominate the real path, grounding is mandatory, and it does nothing for magnetic fields. - [Does the nocebo effect mean the symptoms are imagined?](https://emfbase.com/questions/does-nocebo-mean-my-symptoms-are-imagined): No — nocebo is a mechanism that produces genuine symptoms. Blinded studies show symptoms track belief rather than actual field presence, which changes what helps, not whether the suffering is real. - [How do I find a qualified EMF consultant?](https://emfbase.com/questions/how-do-i-find-a-qualified-emf-consultant): Search the certifier's own register (BBI, IBN, SRP), or an ISO/IEC 17025-accredited lab where the result has legal weight, and judge the survey by whether the report names instrument, calibration, method, positions and the limit compared against. - [How do you convert mG to µT and µW/m² to V/m?](https://emfbase.com/questions/how-do-i-convert-mg-to-microtesla): 1 µT = 10 mG exactly; S = E²/377 in the far field, so 6 V/m ≈ 95,500 µW/m². Neither applies in the near field. - [How far should you live from a cell tower?](https://emfbase.com/questions/how-far-should-i-live-from-a-cell-tower): No authority defines a setback distance; beam geometry dominates, and measured residential levels are hundreds of times below limits. Look up the structure and measure. - [How far should you live from a power line?](https://emfbase.com/questions/how-far-should-i-live-from-a-power-line): Fields usually reach background at 30–60 m; precautionary policy targets are 0.4–1 µT, and a 24-hour log beats any distance rule. - [How far should you sit from a Wi-Fi router?](https://emfbase.com/questions/how-far-from-wifi-router): About 8,000 µW/m² at 1 m for a 100 mW router, 80 µW/m² at 10 m; 2–3 m of separation captures most of the benefit. - [Is 5G more dangerous than 4G?](https://emfbase.com/questions/is-5g-more-dangerous-than-4g): Same type of radiation and same limits; the difference is denser nodes and beamforming. Measured levels are below limits, but the mmWave literature is thinner. - [Is EMF sensitivity (EHS) real?](https://emfbase.com/questions/is-emf-sensitivity-real): Symptoms are recognised as genuine; blinded studies have not linked them to field exposure. WHO recommends evaluating the symptoms clinically. - [What certification should an EMF consultant have?](https://emfbase.com/questions/what-certification-should-an-emf-consultant-have): All practitioner credentials here are voluntary and private; prefer ones with a syllabus, exam and renewal (EMRS, BBEC, IBN, CRadP). ISO/IEC 17025 accredits a lab for a specific method and is what regulators require. - [What is a safe milligauss level?](https://emfbase.com/questions/what-is-a-safe-milligauss-level): ICNIRP's public guideline is 2,000 mG; the epidemiological association starts at 3–4 mG daily average; the building-biology sleeping-area target is under 0.2 mG. - [What is a safe RF level in µW/m²?](https://emfbase.com/questions/what-is-a-safe-rf-level): The regulatory public limit is 10,000,000 µW/m² (1 mW/cm², or 10 W/m²); precautionary sleeping-area bands sit below 10 µW/m². Both refer to the same measurement. - [What is Russia's 10 µW/cm² limit?](https://emfbase.com/questions/what-is-russias-10-microwatt-limit): Russia's public limit is 10 µW/cm² = 0.1 W/m² = 100,000 µW/m² from 300 MHz to 300 GHz, roughly a hundredth of the ICNIRP reference level. - [What is the EMF exposure limit in Canada?](https://emfbase.com/questions/what-is-the-emf-limit-in-canada): Safety Code 6 allows 4.56 W/m² at 1900 MHz and 5.42 W/m² at 2450 MHz for the public, with 0.08 W/kg whole-body and 1.6 W/kg local SAR restrictions. - [What is the EMF limit in Australia?](https://emfbase.com/questions/what-is-the-emf-limit-in-australia): ARPANSA RPS S-1 (2021) adopts ICNIRP 2020 — 10 W/m² for the public above 2 GHz — enforced via licence conditions and the ACMA device standard. - [What is the EMF limit in China?](https://emfbase.com/questions/what-is-the-emf-limit-in-china): GB 8702-2014 allows 0.4 W/m² (12 V/m) below 3 GHz, f/7500 W/m² from 3–15 GHz, and 100 µT / 4 kV/m at 50 Hz — for environmental exposure, not your own devices. - [What is the EMF limit in the UK?](https://emfbase.com/questions/what-is-the-emf-limit-in-the-uk): The UK enforces the ICNIRP public limits (10 W/m² above 2 GHz) through Ofcom's EMF licence condition, in force since 2021. - [What should I do if I think I'm electrosensitive?](https://emfbase.com/questions/what-should-i-do-if-i-think-im-electrosensitive): Have the symptoms evaluated clinically, measure before you buy anything, and remove cheap exposures first. Don't treat precautionary guideline values as health-based limits or shield before measuring. - [What symptoms do people attribute to EMF?](https://emfbase.com/questions/what-symptoms-are-attributed-to-emf): Headache, fatigue, concentration and sleep problems, dizziness, palpitations, tinnitus and skin sensations — non-specific, not a recognised syndrome, and with many common alternative causes that WHO and ANSES say should be evaluated clinically first. - [Where should you start measuring?](https://emfbase.com/questions/what-should-i-measure-first): Measure all four quantities at the sleeping position first, then fix the largest measured contributor one change at a time. The best interventions are usually free. - [Which countries have the strictest EMF limits?](https://emfbase.com/questions/which-countries-have-the-strictest-emf-limits): Russia (0.1 W/m²), China (0.4 W/m²), India (1/10th of ICNIRP), Italy (15 V/m) and Switzerland are the strictest; the U.S., EU, UK, Canada and Australia sit near 10 W/m². - [Which EMF meter should I buy?](https://emfbase.com/questions/which-emf-meter-should-i-buy): Match the instrument class to the quantity: RF meter, three-axis gaussmeter, E-field/body-voltage kit, or IF meter. Demand stated band, real units, peak-hold and calibration. - [Which phones have the lowest SAR?](https://emfbase.com/questions/which-phones-have-the-lowest-sar): Lowest declared ear values among current models here are 0.38–0.53 W/kg against a 2 W/kg EU limit, but declared SAR is a maximum-power compliance figure and ranks test behaviour, not everyday absorption. - [Why are India's tower limits 10 times stricter?](https://emfbase.com/questions/why-are-indias-tower-limits-ten-times-stricter): A 2012 precautionary policy decision cut India's base-station limits to one tenth of ICNIRP: 0.45 W/m² at 900 MHz, 0.9 at 1800, 1 W/m² above 2 GHz. Handset SAR is unchanged. - [Why do FCC and ICNIRP limits differ?](https://emfbase.com/questions/why-do-fcc-and-icnirp-limits-differ): Same thermal basis, different units, averaging masses and breakpoints; some countries add precautionary layers such as Switzerland's installation values. - [Why does the same phone have two different SAR values?](https://emfbase.com/questions/why-does-phone-sar-differ-between-us-and-europe): U.S. SAR is averaged over 1 g against 1.6 W/kg; EU/ICNIRP SAR over 10 g against 2 W/kg. The numbers are not interchangeable, and body-worn values only hold at their declared separation distance. - [Why is the reading high with everything switched off?](https://emfbase.com/questions/why-do-i-get-a-high-reading-with-everything-switched-off): Electric fields exist whenever wiring is energised, so unplug at the socket or fit a demand switch. A magnetic field that stays high everywhere indicates a net-current wiring fault.