There is a lot of paranoia surrounding cell towers s and possibly human health risks. What is important to understand is that radio frequency field intensity is related to the inverse of the distance squared. The exposure that you get from being in the vicinity of a cell tower is hundreds of times lower than the exposure you get using a cell phone.
The only exception to this might be in a situation were cell phone antennas are operated on top of a roof and people are allowed access to that roof top so you can get right up close to the antennas.
Some early studies of cell phone usage showed some adverse health effects, a slightly increased risk of brain tumors and cataracts among them. However, the largest and most recent study did not show any increased risk.
This isn’t to discredit earlier studies however. The earliest cellular handsets operated at power levels up to four watts. Without any external input your brain normally produces about 12-25 watts of heat. An additional 4 watts is a significant heat load and it’s not heat that is distributed evenly but rather concentrated near the antenna. So it is extremely likely that there were significant health risks with these phones.
The next generation cut that power to 1 watt maximum. Still enough for mild thermal effects and possibly some marginally increased risks.
The next generation after that which still operated at 900 Mhz had a maximum transmit level of about 250 milliwatts, a quarter of a watt. This is really approaching a power level where thermal effects are becoming insignificant. These phones only operate at maximum power if they are in a poor signal area.
The very latest generation operating at 1.8 GHz uses a maximum power of 100 milliwatts and will step down to as little as 1 milliwatt if the signal level is good. This is not enough to cause significant thermal heating and is safe.
The field strength you are subject to from cell towers is a small percentage of the field strength you are subject to using even one of these modern phones. They represent no threat.
For cell phone users, more towers reduces your exposure because your modern cell phone steps down it’s power when the signal is strong. If you’re a few hundred yards from a cell tower, that cell tower doesn’t require that your phone transmit at a high power level for it to receive it. If you are several miles, then your phone must transmit at a higher, but still safe, power level.