City Cast Philly logo

Should we be worrying about radon in Philly?

Posted on January 23, 2025   |   Updated on January 28

Siani Colón

A white air quality monitor indicates a radon level of 0.5

A screen on an air quality monitor in Lafayette, Ca., indicating the radon level. (Gado / Getty Images)

January is National Radon Action Month, when the U.S. Environmental Protection Agency encourages residents to test their homes for the gas. In Pennsylvania nearly 40% of homes have radon levels above the EPA’s guidelines. But what exactly is radon and why does it matter?

What is radon?

Radon is an odorless, tasteless, radioactive gas. According to the World Health Organization, radon is produced by the decay of uranium, which is found in rocks and soils. When radon escapes into the air more radon particles are produced as it decays further, contaminating airways. It can enter inside buildings through cracks in the foundation. While radon concerns are primarily airborne, it has been found in drinking water as well. Pennsylvania’s geology, climate, and natural gas wells contribute to radon’s presence in the state. Research has also linked fracking to the increase of the gas in homes.

Why can radon be dangerous?

Because of the gas’ odorless, tasteless nature, it may be difficult to identify whether your home or building is contaminated with radon. Radon is the second leading cause of lung cancer behind smoking, according to the American Lung Association. If you smoke and are also regularly exposed to radon, that puts you at even greater risk of lung cancer. About 21,000 people who were exposed to radon die from lung cancer each year, including 2,900 who were nonsmokers. Radon levels measured above 4 picocuries per liter (pCi/L) are considered cause for concern.

How much radon is in Philadelphia?

This map of radon zones identifies which Pennsylvania counties have the highest potential for radon risk. Philadelphia is designated as Zone 3, the lowest risk level, while surrounding Bucks, Montgomery, Chester, and Delaware counties are Zone 2. The EPA still emphasizes individual testing of buildings for radon risk, no matter the zone designation.

You can use this tool to check the reporting of radon levels by ZIP code. For example although the average level of radon inside basements in the 19134 ZIP code (Kensington, Port Richmond) was recorded at 1.9 pCi/L, the max result was 112.4 pCi/L, way above guidelines.

How can I protect myself?

There are several measures you can take to protect yourself from radon:

  • Request a free test kit from the American Lung Association, or purchase a test kit from a hardware or home improvement store.
  • Find certified testers through the state’s Department of Environmental Protection.
  • If high levels are confirmed in your building, hire a professional to seal any cracks and install a radon mitigation system.
  • Join the Reducing Outdoor Contaminants in Indoor Spaces' next Low Cost Monitoring Project cohort. Although it primarily targets Southwestern Pennsylvanians, ROCIS accommodates a limited number of Pennsylvanians outside that region.
see more:public health

Share article

Hey Philly

Stay connected to City Cast Philly and get ready to join the local conversation.

Can't subscribe? Turn off your ad blocker and try again.

Philly, Explained

See All
Philly, ExplainedSeptember 18

Prove Your Weekly Philly Knowledge

How well do you know Philly's latest headlines and historical facts? Try your hand at this quiz to find out!

A golden statue of a woman with wings holding up a globe is in the foreground, with an Emmy Awards sign and foliage in the background.
Philly, ExplainedSeptember 11

Play Our Philly Crossword Puzzle

This mini-crossword is filled with clues on Philly history and headlines.

City Cast Philly Crossword
Philly, ExplainedSeptember 8

How To Help Promote Literacy in Philly

Learn more about the organizations in Philly that work to improve literacy among children and adults, and how you can get involved.

Four children sitting at a table reading, with bookshelves in the background.
Philly, ExplainedJune 30

What Does It Take To Tell Philadelphia’s Story?

Walk around Independence Mall and learn colonial history from figures such as Bishop Richard Allen.

Robert Branch as Richard Allen speaks to an audience
Philly, ExplainedMay 27

What To Know About the FIFA World Cup in Philly

Philadelphia is gearing up for the big sporting event this June. Here’s how you can be a part of it.

World Cup trophy on a soccer pitch
Philly, ExplainedMay 5

Which Philly Neighborhoods Suffer From a Sidewalk Gap?

A tool from the Delaware Valley Regional Planning Commission can help you track gaps in the Philly area’s sidewalk network.

Map of the Philadelphia region highlighting sidewalk gaps in yellow, red, and green
Philly, ExplainedMay 4

Philadelphia School Board President on Closures: ‘This Decision Wasn’t Taken Lightly’

Reginald Streater described the situation as ‘disheartening’ and said the board tried everything in its power before it reached such a po...

Headshot of Reginald Streater smiling to the camera
Philly, ExplainedApril 22

Land Stewards Union Says It’s All About Empowering Residents

The union is giving residents a collective voice when advocating for their communities and demystifying the Land Bank’s process.

Dominique Johnson stands in front of a vacant lot next to his home.

The latest in Philly

Sponsored

Moving to Philadelphia? What to Check Before You Pick a Neighborhood, Book a Truck, and Sign a Lease

With this guide, you can move to Philadelphia, move from another place to Philadelphia, or just see if living in Philadelphia fits your d...

Wellknown Moving Company Logo
Philly's BestSeptember 21

The Best Oktoberfest Activities in Philly

Sip on beer and see how long you can raise your glass at Philly’s Oktoberfests.

People in traditional German folkwear dance around a pole in front of a crowd.
Keep It LocalSeptember 17

Philly Spirits Worth Trying (and Bringing Home)

Philadelphia has a long tradition of distilling that has evolved from colonial rum and whiskey-making into a new generation of small prod...

Two blue glass bottles of Philadelphia Distilling Co.’s Bluecoat American Dry Gin are displayed on a bar counter inside the distillery alongside a glass of the gin with an orange peel.
Keep It LocalSeptember 17

Philly Quiz: How Well Do You Know Local Liquors?

Test out your local Philadelphia business knowledge with this quiz.

New Liberty Distillery’s Kinsey line of spirits shows a bottle of bourbon whiskey, American whiskey, and rye whiskey.
Food & DrinkSeptember 14

Where To Grab a Hoagie in Philly

Whether you’re craving a classic Italian hoagie or a bold spin on the sandwich, these Philly restaurants have you covered.

A hoagie stuffed with meats, lettuce, tomato, and cheese.
Keep It LocalSeptember 10

Where to Shop for Eagles Gear Locally

Philly takes its Eagles fandom seriously, and thankfully, you don’t have to settle for the same jersey or sweatshirt everyone else is wea...

A display of Philadelphia and Eagles-themed T-shirts and crew necks on the wall and on a shelf at Hey There Philly in East Passyunk.
Keep It LocalSeptember 10

The Philly Streetwear Brand That Gets Eagles Culture

The list of current and former Philadelphia pro sports players, staff, and celebrities who have worn Jay Pross’ designs is long and inclu...

Art History 101 Founder and Creative Director Jay Pross likes to capture moments from Philly sports on T-shirts, like this one of Eagles running back Saquon Barkley. (Courtesy Art History 101)
Food & DrinkSeptember 10

Watch Your Favorite Philly Sports at These Bars This Fall

Make one of these bars or restaurants your prime destination to root for Philly’s teams this season.

Multiple beers on tap included Lamps, Heineken, Coors Light, and Guinness at a bar.