Johns Hopkins大學Bloomberg公共衛生學院(Baltimore, MD, USA)的研究人員，對居住在美國204個縣11.5百萬超過65歲的人群，進行了暴露于細小顆粒的分析。使用1999-2002報表記錄，他們追蹤了各種疾病導致的每日入院治療數字。他們還從空氣監測站獲得了空氣細小顆粒濃度的資料。

研究顯示：短期暴露于細小顆粒空氣污染發射，顯著增加超過65歲人群的心血管和呼吸系統疾病發作的危險。
 
Pollution Adds to Heart Risk in the Elderly
 
A new study shows that short-term exposure to fine-particle air pollution emissions significantly increases the risk for cardiovascular and respiratory disease among people over 65 years of age.

Researchers at the Johns Hopkins Bloomberg School of Public Health (Baltimore, MD, USA) conducted a fine-particle analysis on 11.5 million people over 65 who lived in 204 U.S. counties. Using billing records for 1999-2002, they tracked daily counts of hospital admissions for a range of medical conditions. They then obtained daily measurements of fine particle concentrations from a network of air monitoring stations.