Indoor radon poses one of the most significant environmental threats to public health as it is the second leading cause of lung cancer in the United States. Developing a more thorough understanding of the factors that affect radon concentrations is key for developing risk maps, identifying where testing should be a priority, and education about indoor radon exposure. The objectives of this study are to investigate seasonal and annual variation of indoor radon concentrations in Pennsylvania, USA from 1988 to 2018, to explore the hotspot areas for high indoor radon concentrations, and to analyze the association with various factors such as weather conditions, housing types, and floor levels. Based on a total of 1,808,294 radon tests conducted from 1988 to 2018, we found that 61% of the area (by zip codes), 557,869 tests conducted in the basement and 49,141 tests conducted on the ground floor in homes in Pennsylvania had higher radon levels than the U.S. EPA action level concentration of 148 Bq/m³ (equivalent to 4 pCi/L). Winter and fall had significantly higher indoor radon concentrations than summer and spring. Case studies conducted in Pittsburgh, Philadelphia, and Harrisburg showed that there was no significant correlation of daily temperature, precipitation, or relative humidity with indoor radon concentration on the day a radon test occurred.

室内ra气是对公众健康的最重大环境威胁之一，因为它是美国第二大肺癌成因。深入了解影响ra浓度的因素是制定风险图，确定应优先检测的地点以及室内indoor暴露教育的关键。这项研究的目的是调查1988年至2018年美国宾夕法尼亚州室内ra浓度的季节性和年度变化，探索高室内concentrations浓度的热点地区，并分析与天气条件，住房等各种因素的关联类型和楼层。根据1988年至2018年进行的总共1808294次ra测试，我们发现，该地区61％的地区（按邮政编码）为557，³（相当于4 pCi / L）。冬季和秋季的室内ra浓度明显高于夏季和春季。在匹兹堡，费城和哈里斯堡进行的案例研究表明，在进行ra测试的当天，每日温度，降水或相对湿度与室内ra浓度没有显着相关性。