Optical carbon analysis measurements were performed on Teflon filters from the Federal Reference Method (FRM) network in New York over the period 2015–2019. The optical measurements were performed using an inline Magee Scientific OT21 transmissometer coupled to the robotic weighing system (RWS) that measures PM_2.5 mass gravimetrically. Light attenuation from the Teflon filters was compared to elemental carbon (EC) measured on quartz-fiber filters across 8 locations from the Chemical Speciation Network (CSN). The coefficients of determination (R²) were highest at urban locations (where EC concentrations were highest) and lowest at the remote rural sites. The regression slopes provided mass absorption cross-sections (MAC) from 9.12 to 11.0 m²/g at 880 nm which are in agreement with literature values. Transmissometer measurements of black carbon (BC) were also compared to Aethalometer® BC as well as EC from a semi-continuous Sunset Laboratory Inc. OCEC carbon analyzer at two locations. BC estimated from the optical measurements decreased by approximately 30 % over the 2015–2019 period consistent with the replacement of older heavy duty diesel (HDD) vehicles. BC was highest across urban locations and lowest in the rural sites. At the urban locations BC was generally highest in winter and summer, whereas at the rural sites BC was highest in summer. Both locations showed the lowest BC was in spring. Weekday vs weekend analysis revealed BC was on average lower at the weekend by approximately 20 % in NYC and 9–16 % in upstate locations.

2015 年至 2019 年期间，在纽约联邦参考方法 (FRM) 网络的特氟龙过滤器上进行了光学碳分析测量。使用与机器人称重系统 (RWS) 耦合的在线 Magee Scientific OT21 透射仪进行光学测量，该系统通过重量分析法测量 PM _2.5质量。将 Teflon 过滤器的光衰减与在来自化学形态网络 (CSN) 的 8 个位置的石英纤维过滤器上测量的元素碳 (EC) 进行了比较。决定系数 (R ² ) 在城市地区（EC 浓度最高）最高，在偏远农村地区最低。回归斜率提供了从 9.12 到 11.0 m ^{2 的}质量吸收截面 (MAC)/g 在 880 nm 与文献值一致。黑碳 (BC) 的透射仪测量值还与来自半连续 Sunset Laboratory Inc. OCEC 碳分析仪在两个位置的 Aethalometer® BC 和 EC 进行了比较。根据光学测量估计的 BC 在 2015-2019 年期间下降了约 30%，与更换旧的重型柴油 (HDD) 车辆一致。BC 在城市地区最高，在农村地区最低。在城市地区，BC 在冬季和夏季普遍最高，而在农村地区，BC 在夏季最高。两个地点都显示最低 BC 是在春季。工作日与周末的分析显示，BC 在周末的平均水平在纽约市下降了大约 20%，在北部地区下降了 9-16%。