RealtyTrac has released its first report ranking all U.S. counties based on the prevalence of man-made environmental hazards. “Somewhat surprisingly, short-term home price appreciation over the past year and five years is stronger in the 50 housing markets with the highest prevalence of man-made hazards,” said Daren Blomquist, vice president at RealtyTrac. “However, the 50 housing markets with the lowest prevalence of man-made hazards have higher median home values and much stronger long-term home price appreciation over the last 10 years along with lower unemployment rates and slightly higher median incomes.