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A widely used but controversial herbicide linked to cancer is showing up in people, with a government study finding glyphosate in more than 80% of urine samples from U.S. kids and adults. Part of a Centers for Disease Control and Prevention program, the National Health and Nutrition Examination Survey found glyphosate in 1,885 of 2,310 urine samples representative of the population at large. Nearly a third of the samples came from kids, ranging in age from six to 18. (Gibson, 7/11)

A new report found a "statistically significant" excess of cancer cases among people of all ages living within a Long Island school district compared to similar areas of the state. The report, from the New York State Department of Health, looked at cancer cases over 20 years within the Northport-East Northport School District in Suffolk County -- about 45 miles from Manhattan. (Kekatos, 7/11)

The Marsh Fire caused “unhealthy and at times hazardous air” in Pittsburg on Monday, according to Contra Costa County health authorities, who urged residents to stay inside with their windows and doors closed. (Galbraith, 7/11)

Data from Madison and Milwaukee are helping shape a tool that could help communities better recognize and reduce the health risks posed by hot weather. The cities are among just six pilot programs worldwide for a ranking system that uses mortality and weather data to categorize heat waves based on their danger to human health. (Heim, 7/11)

If Wilbur Earl Tennant’s cows hadn’t died from a mysterious wasting disease during the 1990s, the world might have never learned about the secret history of toxic forever chemicals. (Hawthorne, 7/11)