CONCORD, N.H. — Health officials say tests have detected low levels of radioactivity from a stricken Japanese nuclear plant in snow samples in New Hampshire and air samples in Maine.

Health officials say the levels do not pose a threat to public health.

Dr. José Montero of the New Hampshire Department of Health and Human Services says the amount of radiation detected in snow in Concord is at least 25 times below the level of concern, even for infants and pregnant women.

Dr. Stephen Sears, acting director of Maine’s Center for Disease Control, tells WMTW-TV that the level of radioactive iodine detected in air samples in Kittery, Augusta and Orono was much lower than naturally occurring radiation, which is found in sunlight and radon.

Vermont’s expected to have test results by Tuesday.