2025年3月28日 · This is the homepage for EPA’s PM2.5 Chemical Speciation Network (CSN). The CSN is an ambient monitoring network comprised of the Speciation Trends Network (STN) and supplemental sites.

2024年11月18日 · Important Chemical Speciation Network (CSN) documents can be found below, including current sampling calendars, a master site list and historical documents from the beginning of the program. This page includes general information about the Chemical Speciation Network that is not covered on the main page.

EnvironmentalProtection Agency (EPA) initiated the national PM2.5 Chemical Speciation Monitoring Network (CSN) in 2000 to support evaluation of long-term trends and to better quantify the impact of sources on particulate matter (PM) concentrations in the size range below 2.5 μm aerodynamic diameter (PM2.5; fine particles).

2014年11月14日 · The CSN self-absorption procedure is a modification of the protocol used by the EPA with the Thermo Scientific QuantX spectrometers (Dzubay and Wilson, 1974; EPA, Citation 1999c). The procedure corrects for signal loss due to scattering and absorption by calculating an absorption correction factor that compensates for measured intensities in a ...

Some of the PM2.5 elements of most interest are not always detected above the XRF method detection limits (MDLs). EPA is working with UC Davis on a special study to explore the use of Inductively Cou- pled Plasma Mass Spectrometry (ICPMS) …

6 天之前 · This page contains the field operations Quality Assurance Project Plan (QAPP) , Standard Operating Procedures (SOP), and other information for the operation of the Chemical Speciation Network (CSN) samplers.

2013年8月15日 · To fill this gap, the EPA and the National Park Service (NPS) established or expanded national chemical speciation monitoring networks to collect atmospheric particulate matter at urban sites (EPA) with a focus on linking sources to health effects (Federal Register, 1997) and at rural to pristine sites (Class I areas; NPS) with a focus on linkin...

You can find previous editions of the newsletter here. We use the newsletter to communicate information on CSN that is useful to the State, Local, and Tribal (SLT) monitoring agencies and data validators, as well as users of CSN data. The EPA AMTIC page for CSN is here.

2020年7月1日 · This is the homepage for EPA’s PM2.5 Chemical Speciation Network (CSN). The CSN is an ambient monitoring network comprised of the Speciation Trends Network (STN) and supplemental sites.

EPA is using a phased approached for updating these metadata records with its CSN partners. The goal is to have phase 1 completed by April 2022. In phase 1 the 'Sampler ID' and 'channel count' AQS fields are updated. In phase 2, the CSN program begins updating the 'channels' and 'filter types' for those samplers in AQS that need edits.