Mercury emitted to the atmosphere has a long residence time (up to a year) and can travel long distances before being deposited to land or ocean surfaces. The objective of this study were to evaluate the total gaseous mercury (TGM) ambient levels in the San Joaquín, Querétaro, mining region and to observe whether the TGM emissions from mining activity impact other regions of the country due to its dispersion. TGM was measured using an automatic Tekran model 2537A air mercury analyzer; the monitoring was carried out during March, April, and May 2015. From the ambient measurements carried out, the 8-h average concentrations range from 67 to 74 ng/m³, while the monthly averages for these three months were from 40 to 41 ng/m³ (1.3 ± 0.4 ng/m⁻³). Mercury concentrations did not vary significantly during the 24-h survey measurement, reporting an average value of 40.3 ± 0.75 ng/m³ (40.1 ng/m³ averages) and an extreme value of 235 ng/m³. In order to identify the possible TGM fate, a set of trajectories was obtained for different time periods using the wind fields from the Water Research and Forecasting (WRF) meteorological model and a dispersion was performed by using the CALPUFF model driven by the WRF-CALMET model to identify the TGM levels in the site vicinity.

排放到大气中的汞有很长的停留时间（长达一年），并且在沉积到陆地或海洋表面之前可以长途跋涉。本研究的目的是评估圣华金、克雷塔罗矿区的总气态汞 (TGM) 环境水平，并观察采矿活动的 TGM 排放是否因其分散而影响该国其他地区。使用自动 Tekran 2537A 型空气汞分析仪测量 TGM；监测时间为 2015 年 3 月、4 月和 5 月。从进行的环境测量来看，8 小时平均浓度范围为 67 至 74 ng/m ³，而这三个月的月平均值为 40 至 41纳克/米³ (1.3 ± 0.4 纳克/米^-3）。在 24 小时调查测量期间，汞浓度没有显着变化，报告的平均值为 40.3 ± 0.75 ng/m ³（40.1 ng/m ³平均值）和 235 ng/m ³的极值。为了识别可能的 TGM 归宿，使用来自水研究和预测 (WRF) 气象模型的风场获得了不同时间段的一组轨迹，并使用 WRF-CALMET 驱动的 CALPUFF 模型进行了分散模型来识别站点附近的 TGM 水平。