United States Department of Transportation
i
A Comprehensive Analysis of the Air Quality in the NYC Subway System [Supporting Dataset]
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2022-09-02
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Edition:Final report, 3/1/21-9/30/22
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Abstract:We have carried out a study analyzing the concentrations of particulate matter in the New York City subway system. Realtime and gravimetric measurements were made inside train cars along the full length of 9 subway lines, as well as real-time measurements on 341 platforms from 287 stations, all at one-second intervals that the mean (±SD) PM2.5 concentrations on the underground platforms was 216 ± 82 μg/m3 versus 29 ± 27 μg/m3 for aboveground stations. Concentrations inside train cars were 148 ± 51 μg/m3 when traveling through underground tunnels and platforms, and 22 ± 44 μg/m3 while on aboveground tracks. US EPA’s standards limit the allowable daily average PM2.5 mass concentration at 35 μg/m3. Using particle element analysis, we found that the concentration of iron particles in subway stations was 140 times higher than ambient outdoor levels. Other trace elements measured in the NYC subway system include silicon, copper, nickel, aluminum, calcium, barium, Manganese, and chromium. Results also suggest that when train cars are at stations with doors open, mixing of air between the platform and cars results in a rapid increase of PM concentrations in the cars. The total size of the described file is 10.1 KB. Files with the .xlsx extension are Microsoft Excel spreadsheet files. These can be opened in Excel or open-source spreadsheet programs.
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Content Notes:National Transportation Library (NTL) Curation Note: As this dataset is preserved in a repository outside U.S. DOT control, as allowed by the U.S. DOT’s Public Access Plan (https://doi.org/10.21949/1503647) Section 7.4.2 Data, the NTL staff has performed NO additional curation actions on this dataset. The current level of dataset documentation is the responsibility of the dataset creator. NTL staff last accessed this dataset at its repository URL on 2023-07-27. If, in the future, you have trouble accessing this dataset at the host repository, please email NTLDataCurator@dot.gov describing your problem. NTL staff will do its best to assist you at that time.
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