Placing cell towers 500 meters away from schools and hospitals could save companies
trouble down the road.
No one can overengineer like an engineer. So introducing a little more caution into
an existing engineering process is nothing much to ruffle feathers. A new paper published
in Environmental Research offers insight on how to include simple precautionary approaches to siting cell towers.
And there are many cell towers — and more coming — since almost everyone has a cell
phone and the towers are being used for more data intensive applications. In the U.S.,
the Pew Research Center reports 96% of Americans own a cell phone of some kind, and
smart phone ownership today has risen to 81% from 35% in 2011. Industry data reported
by GSMA Intelligence estimates more than five billion people worldwide use mobile
devices. All these devices work using electromagnetic waves, which expose people to
low levels of radio-frequency radiation (RFR).
“The research on the health impacts of RFR is still inconclusive. But some of the
preliminary data gives us reason to be concerned,” said Joshua Pearce, a professor
in electrical and materials engineering from Michigan Technological University who
led the study, which reviews current data on RFR and engineering solutions for placing
towers. “I’m pro-tech and I’m pro-human, so I think there are ways for us to have
our cell phones and minimize potential risk without waiting to find out that putting
a cell tower on top of a school was a bad idea.”
Pearce and his team’s solutions focus on getting companies to rethink where to place
cell towers when they do a standard “search ring” map that prioritizes potential sites
based on maximizing coverage for the least cost. Assessing tower placement is not
a new idea; Canada and many European countries are looking into siting guidelines
that help keep particularly vulnerable populations safe, like kids and those with
illnesses.
The handful of human studies reviewed in Pearce’s paper indicate that proximity to
base stations correlates with headaches, dizziness, depression and other neurobehavioral
symptoms, as well as increased cancer risk. Animal studies also indicate that these
effects may be cumulative (see sidebar).
Cumulative RFR Impacts on Non-humans
- Mice exposed to low-intensity RFR became less reproductive, and after five generations
of exposure, the mice were not able to produce offspring - DNA damage in cells after 24 hours exposure to low-intensity RFR, which can lead to
gene mutation that accumulates over time - Increased sensitivity to behavior-disruption experiments in rats and monkeys
- More permeability of the blood-brain barrier in mice, suggesting that short-term,
high-intensity exposure can produce the same effect as long-term, low-intensity exposure
Given the current research, cell towers would be cautiously placed 500 meters, or
about a third of a mile, away from schools, hospitals and lots of sleeping people
in dense neighborhoods or high rises.
The challenge in the U.S., unlike in India where such setback laws are already in
place, is the laws that govern cell tower siting plans in Section 704 of The Telecommunications
Act of 1996 specifically eliminate “environmental effects” from consideration.
“This is a peculiar law, but saying that something is legal doesn’t make it right
or cost-effective in the long run,” Pearce said. “It’s in companies’ best interests
to be thoughtful about where to place cell towers; they don’t want to move towers
or be held responsible down the line. These effects are inadvertent — but there are
options to do it differently that can reduce potential health impacts and thus a company’s
future bottom line.”
In addition to revamping search ring mapping to include a 500-meter buffer, which
doesn’t impact the cost of the siting process but reduces future liability, Pearce
says there are other more innovative options, like cell splitting and small cell deployment,
that could also decrease RFR exposure. At the end of the day, it comes down to thinking
before building.
Michigan Technological University is a public research university, home to more than
7,000 students from 54 countries. Founded in 1885, the University offers more than
120 undergraduate and graduate degree programs in science and technology, engineering,
forestry, business and economics, health professions, humanities, mathematics, and
social sciences. Our campus in Michigan’s Upper Peninsula overlooks the Keweenaw Waterway
and is just a few miles from Lake Superior.
