Half the wireless around you comes from towers. The rest is closer

What is over your head on a city street?

Mostly towers talking to phones, and roughly half of everything a meter picks up comes down from them. The other half transmits within arm’s reach of you, which is the half you can move.

Arno Thielens and three colleagues at CUNY’s Advanced Science Research Center put a meter in a backpack and walked 38 planned routes across all five boroughs, from September 2024 to May 2025. The average across every route came to 0.97 volts per meter.

Picture that walk. A backpack at chest height, a meter inside it sampling 39 bands at once, from FM radio at 88 megahertz up to 5.925 gigahertz. A person carrying it through Queens at whatever speed people walk in Queens.

No modeling. No estimating from a map of antennas. Somebody went out and stood where people stand, which is rarer in this subject than you would guess.

Then one source ran away with everything else. Signal coming down from towers to handsets, which engineers call downlink, made up 45 to 55 percent of what that backpack picked up, in every borough.

Manhattan, Brooklyn, Queens, Bronx, Staten Island. Five very different places, one answer.

Has anybody measured this before?

In 1976 EPA sent a three-person crew out on a two-year drive around big American cities, stopping at 14 to 18 spots in each one, to find out how much radio energy people were living in.

Richard Tell and Edwin Mantiply published what came back. 486 locations, 15 cities, roughly 14,000 separate measurements of what was in the air.

Then a computer spread those figures across some 47,000 census districts and estimated what about 44 million people were sitting in. About 20 percent of this country, worked up from 486 stops.

And what were they listening for? Television and FM radio. Tell and Mantiply wrote that broadcast was the main source of ambient radio exposure in this country, and on their evidence it was.

No mobile network existed to measure. What dominates a New York sidewalk today is missing from their survey because it was missing from the world.

That is worth sitting with before anybody quotes a multiple at you. The two surveys were not measuring the same thing badly. They were measuring different worlds, forty years apart, with instruments built for different questions. A comparison across that gap is a description of how much changed, not a measurement of how much anything rose.

Can you put a multiple on the rise?

Not from these two. Look at what they had.

A rise across half a century happened, and nobody disputes it. Putting a precise multiple on it is not something these two surveys can support, because neither was built to be held up against the other.

The instruments were not the same. Nor were the bands, nor the units the answer came back in. One crew sampled a handful of broadcast frequencies from a parked van, and one walk covered 39 bands including every cellular one.

What is solid is smaller than a multiple, and more useful. Today’s dominant source didn’t exist in 1976, and today’s walk covered frequencies nobody looked at then.

Is a sidewalk anywhere near what federal rules allow?

Nowhere close. FCC caps public exposure at 27.5 volts per meter in the band where it’s strictest, and that walk averaged 0.97, about 3.5 percent of it.

Two things about that cap are worth keeping in view at once, and most writing on this subject drops one of them.

That figure carries the force of law, and it assumes you never get a break. Those limits are written for continuous exposure over indefinite periods, not for one bad afternoon.

Now look at what it was built to prevent. It comes from how much energy a whole body soaks up, and what soaked-up energy does is warm tissue.

So a street result far under that cap answers one question well. Nothing out there’s heating anybody up.

It leaves a second question open, because a limit built around warming was never designed to tell you whether years at much lower exposure do anything at all. Anybody who says a federal cap proves safety at any exposure is claiming more for it than FCC does.

wireless-and-cancer”>What have scientists settled about wireless and cancer?

Less than either side of this argument will tell you.

Thirty-one scientists from 14 countries spent a week together in Lyon in 2011, working through the evidence, and came out putting radio signal in a bucket labeled possibly carcinogenic to humans. What drove that was glioma risk in people using wireless phones.

Read what that describes. A phone held against a head, rather than an antenna on a roof three blocks away.

Ken Karipidis and colleagues then went back through 63 studies published between 1994 and 2022, out of 22 countries, and asked a narrower question. What about fixed transmitters, meaning broadcast antennas and base stations, the things standing over a sidewalk?

Moderate confidence that exposure from those likely doesn’t raise childhood leukemia risk. Weaker confidence that it may not raise childhood brain tumor risk.

No study cleared their bar for adults. Not one.

That’s the honest shape of this subject. Two questions answered with middling confidence, one large one nobody has managed to ask properly, and a lot of people on both sides talking as though it were settled.

Does a walk down a street say anything about your bedroom?

Very little, and it misses in both directions.

Buildings block. Walls, windows and structure cut outdoor signal, so an apartment can sit well under whatever a sidewalk carries.

Buildings also transmit. Your own router. Another one on the far side of a shared wall. A cordless phone. A smart meter humming in a hallway. So a quiet street can sit under a busy living room.

Height matters as well. A top floor with a clear view of a rooftop installation isn’t the same place as a ground-floor unit behind masonry.

Building biology guideline values, the ones people quote at each other online, were written for rooms where somebody sleeps every night for years. Set one of those against a sidewalk average and you’ve compared two different things.

A city walk tells you about a city. If your question is your own bedroom, somebody has to go and measure your bedroom, and no federal agency publishes a target for whatever they find in there.

What can you change about it?

Whatever transmits within arm’s reach, because that’s the part you own.

Half of what that backpack picked up came down from towers, and nobody is moving those. Busier sidewalks carried more signal than quiet ones, because a network gets built where people already are. Infrastructure follows crowds. Nothing stranger than that’s going on.

Near you is a different matter. A phone against a head was the exposure that put radio signal in that possibly-carcinogenic bucket in the first place, and a phone across a table isn’t a phone against a head. Speaker. Headphones. A router that lives somewhere other than beside a pillow.

None of that’s a treatment for a risk anybody has established, and we’d rather say so than sell you a habit. Distance is the one thing in this subject nobody argues about, it costs nothing, and it belongs to you.

Where you live decides which of those levers you have at all. A tenant in a walk-up shares walls with four or five routers and controls none of them. A homeowner can move a router down a hallway and off a bedroom wall. Somebody in a rural house with one router and no neighbors within a hundred yards already has the quiet end of this, and their exposure is mostly whatever they carry in a pocket.

So the honest ranking is the same everywhere and the effort differs. Phone first, because it rests against a head and it is entirely yours. Router second, because moving it is free. Everything beyond those two belongs to a landlord, a carrier or a city.

What should you take from all this?

Three things, and not one of them is a scare.

Towers dominate, rather than the gear in your house. If you want your own exposure lower, a phone and a router are the two you can move.

Street results sit far under a federal cap, and that cap is about heating. Both halves of that sentence matter, and almost everybody writing on this drops one.

And nobody measured your home. A walk across Manhattan is context, genuinely interesting, and still not your address.

One more thing, said plainly. We could not open the full paper. ScienceDirect answers an automated request with a verification challenge and a 403, so everything above comes from the abstract those four researchers published rather than from reading the whole thing end to end. We’d rather tell you that than let you assume we read it.

And here is the part we keep coming back to. It took four people and a backpack to find out what is over a New York sidewalk, half a century after a federal crew drove out to ask the same question.