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New York City
Indoor Radon Estimates
Percent Homes Above 4 pCi/L
June 1999

Town or City
homes
measured
living area*
basement**
best
estimate
(%)
range #
(%)
best
estimate
(%)
range #
(%)
New York (Manhattan) 0.9 (0.5 - 1.4) 4 (3 - 6)
Bronx 1.7 (1.0 - 2.6) 8 (6 - 10)
Kings (Brooklyn) 1.7 (1.4 - 2.1) 11 (9 - 12)
Queens 0.6 (0.5 - 0.8) 3 (3 - 4)
Richmond (Staten Island) 1.3 (0.9 - 1.8) 5 (4 - 6)

* Long-term measurement, 90 days to one year.

**Short-term measurement, typically 2 to 7 days.

# Uncertainty range of one sigma corresponds to a 68% confidence interval.


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New York State Department of Health - Wadsworth Center

Revised: June 2001