NADP News

Starting in July 2025 the output of the MDN Weekly Sample Export is changing to include the SampleID field. This will facilitate communication regarding samples, as well as make the NTN and MDN reports more similar. The original report fields (in order) were: siteID | dateOn | dateOff | yrmonth | sampletype | qr | notes | rgPpt | sVol | subppt | HgConc | HgDep | datemod The updated report fields (in order) are: siteID | dateOn | dateOff | yrmonth | sampletype | qr | notes | rgPpt | sVol | subppt | HgConc | HgDep | datemod| sampleID  If there are […] View

The following updates are in place since Fall 2024 to ensure operators are provided with an accurate display of their uploaded precipitation: The PPT Data completeness measure on the Daily Data table now shows the number of records received instead of a percentage. A 24 hour period may contain up to 96 records (4X24 for […] View

The concentration and deposition maps and grids have been updated in the NTN gradient maps page. Starting in November 2024, the original maps, reflecting data generated from an incorrect NH4 mdl value, have been marked as with an “(ERR)” note. The normal links now reflect the updated 2016 and 2017 NH4 values which were corrected […] View

On November 12, 2024, the NADP AMoN Data Export function changed from delivering dynamically coded data to statically coded data. This update also corrected some coding mistakes. If you downloaded AMoN data prior to November 7th 2024, please read the timeline and details below to see what was corrected in the data. The August 2024 […] View

Call for Abstracts” for the 2024 NADP Fall Meeting and Scientific Symposium that will take place November 4-8, 2024 in Duluth, MN.    The meeting theme is “Protecting the Health of Communities and Ecosystems in a Changing Climate”. Oral and poster presentations are invited on all aspects of deposition monitoring, networks, equipment, sampling and analytical methods, modeling, research […] View

The Widespread impacts to precipitation of the East Palestine Ohio train accident paper was published in the Environmental Research Letters Journal. The paper was co-authored by David Gay, Katie Blaydes, Jamie Schauer, and Martin Shafer. Precipitation chemistry measurements routinely collected by the National Atmospheric Deposition Program (NADP) to estimate the spatial extent and chemical compounds […] View

The NADP now offers measurements of per- and polyfluoroalkyl substances (PFAS) in precipitation? The new PFAS-NTN (PFN) pilot network was established on Jan. 1 2024 after several years of method development and evaluation. Learn more about PFN on the new website: https://nadp.slh.wisc.edu/pfas-sub-network/ View

NADP is launching a new Data Request Form for requesting custom reports from NADP. Custom reports may involve chemistry or precipitation data not currently provided by the web pages, or specific site or agency data as requested by specific agencies. Using this form fulfills a couple needs to help us improve our data sharing. It […] View

Precipitation Data Adjustments In the past year, NADP has been making updates to how the electronic precipitation gauges are configured. Previously, almost all gauges were set to report precipitation data using Greenwich Mean Time (GMT). NADP, via Environmental Engineering and Measurement Services, Inc. (EEMS), is resetting these electronic gauge clocks to report precipitation data using […] View

NADP has released a change log which documents when published data has been updated. The change log can be found in either the NTN or MDN network page under the “Data Notices” section. Metadata for the change log can be found in either the NTN or MDN network page under the “Metadata” section. The change […] View

Air Quality Awareness Week 2024 This year Air Quality Awareness Week will be celebrated May 6-10, 2024.  The purpose of Air Quality Awareness Week is to bring attention to air pollutants that damage human health and environmental health.  The AQAW workgroup developed content that focuses on the effects of air pollution on environmental health. Each day […] View

In a continued effort to make more aspects of all NADP networks consistent, we updated the format of NTN sample ID numbers. Starting tomorrow, 3/1/2024, new NTN sample ID numbers will be used. The old format remains in place for the past samples, but anything received on 3/1 and beyond will have the new formatted […] View

In November 2023, an error was discovered in the script used to calculate the monthly, seasonal, annual, and water year PWM values for conductance. The script was incorrectly multiplying the weekly value by 0.5, reducing the calculated conductance PWM values by half. This affected all aggregated monthly, seasonal, annual, and wateryear conductance values for 2021 […] View

In mid-November 2022, a contamination issue was discovered with the MDN sample collection bottles that had been in circulation since the end of August 2022. Once identified, the lab immediately stopped sending out bottles from the contaminated bottle lot. It should be noted that this bottle lot was appropriately screened with a robust lot validation […] View

Air Quality Awareness Week 2023 This year Air Quality Awareness Week will be celebrated May 1-5, 2023.  The purpose of Air Quality Awareness Week is to bring attention to air pollutants that damage human health and environmental health.  The AQAW workgroup developed content that focuses on the effects of air pollution on environmental health. Each day […] View

In mid-November 2022, a contamination issue was discovered with the MDN sample collection bottles that had been in circulation since the end of August 2022. Once identified, the lab immediately stopped sending out bottles from the contaminated bottle lot. It should be noted that this bottle lot was appropriately screened with a robust lot validation […] View

In late 2022 it was recognized that the NH4 values appeared to be too high for the 2016 NTN network data. Investigation determined that the data was calculated with an incorrect value of the Method Detection Limit (MDL) for NH4. The incorrect value was set at 0.19mg/L, while the correct value was actually 0.019 mg/L. […] View

The 2023 Spring meeting registration is now open. Visit the NADP 2023 Spring Meeting website page for more information. There is no cost for registration. View

The Fall Meeting and Scientific Symposium registration is now open. Visit the NADP 2022 Fall Meeting and Scientific Symposium website page for more information. A reminder the abstract submission deadline date has is Friday September 2, 2022.  View

The abstract submission deadline date has been extended to September 2, 2022. Visit the NADP 2022 Fall Meeting and Scientific Symposium website page for more information. View

The 2020 Acid Rain Conference abstract submission deadline has passed. The conference is was held April 17-21, 2023 in Niigata, Japan. View

At the Spring 2022 meeting, Pam Padgett (U.S. Forest Service) was presented with the Van Bowersox Meritorious Service Award “For her leadership and contributions to the advancement of the NADP with regard to educational outreach and ecological studies”. Congratulations Pam! View

MDN 1L Bottle and Thistle Issue MDN operators may have noticed some recent issues with the MDN sample bottles and the glass thistle bulbs. Due to the ongoing supply chain issues, we had to purchase the 1L PETG bottles from a different supplier. Unfortunately the mouth of the new bottle is slightly larger than the […] View

Air Quality Awareness Week 2022 This year Air Quality Awareness Week will be celebrated May 2-6, 2022.  The purpose of Air Quality Awareness Week is to bring attention to air pollutants that damage human health and environmental health.  The AQAW workgroup developed content that focuses on the effects of air pollution on environmental health. Each day […] View

The U.S. Forest Service has produced a new video series that looks at how air pollution, specifically excess nitrogen and sulfur deposition, affects species and ecosystems. It also highlights how land managers can use critical loads to assess ecosystem health and guide resource management decisions. The series includes seven videos. A playlist is available on […] View

The new NADP Mercury brochure “Mercury in the Atmosphere & Environmental Effects” is now available on the website. It can be accessed here. View

The 2020 Quality Assurance Reports (QAR) for the CAL, HAL, and AMNet are available here. View

The 2020 Annual Summary is now available on the website. It can be accessed here. View

The new NADP website is now live. We look forward to any feedback, comments, or suggestions. As well if there are any links that are not working, please report them to us by sending an email to nadp@slh.wisc.edu.   Technical subcommittee and science committee can submit updates, documents, and changes to the Program Office for […] View

Ellis B. Cowling received a B.S. in Wood Technology from State University College of Forestry at Syracuse University in 1954, a M.S. in Forest Pathology from Syracuse in 1956, and a Ph.D. in Plant Pathology and Biochemistry from the University of Wisconsin in 1959. He received a Filosofie Doktor (Ph.D.) in Physiological Botany from the […] View

The next training session will be held virtually on Monday November 8, 2021 at 15:00 EST/14:00 CST/13:00 MST/12:00 PST. The topic will be NTN Bag Sampling – 1 year in: The good, the bad, the ugly The format will be a brief presentation followed by a Q&A session. The Q&A is an opportunity for operators […] View

The next operator virtual training session is scheduled for Monday October 4, 2021. The topic will be “Equipment Winterization”. In order to prevent damage to your equipment, it should be prepared for the winter season. This training session will cover the NTN and MDN collectors, the raingages, and AMoN shelters. As well there will be […] View

The dates for the NADP 2021 Fall Meeting have been set for October 25-29, 2021. Please note that we are planning for virtual meeting.  Meeting information is available on the website. View flyer. View

The next operator virtual training session is scheduled for Monday June 14, 2021. The topic will be “Is Your Site Impacting your Data?”. Approximately every 4 years sites are surveyed by EEMS to assess siting criteria, equipment and operator performance. A number of issues at your site could be impacting the quality of your data. […] View

The NADP Central Analytical Lab will begin disposal of NTN, AIRMoN and AMoN archived samples which have exceeded our sample retention policy. The following samples are available prior to disposal: NTN Archive Samples: 10 to 60 mL filtered precipitation (stored at 4°C); Samples from 2014 and 2015 AIRMoN Archive Samples: 10 to 200 mL unfiltered […] View

Notice regarding pH data analyzed from June 1, 2018 through February 4, 2020. This includes NTN sample IDs TT0001SW-TV1558SW and AIRMoN samples AE001L-AE0769L. This pH data set may have a slight bias due to the use of an incorrect pH meter calibration curve. All quality control samples associated with pH analysis during this timeframe met criteria (unless qualified […] View

At the 2020 NADP Spring meeting, the Executive Committee approved the National Trends Network (NTN) to make the switch from bucket sampling to bag sampling. The transition was started in October 2020 and continues with over 98% of the sites now transitioned. The switch from buckets to bag sampling will result in significant shipping cost […] View

The NADP Central Analytical Laboratory (CAL) determined that web-published bromide data from January 2012 through June 2018 have a known or suspected bias caused by the presence of oxalate in the precipitation. Motions to remove these data from the NADP website and discontinue bromide as an official NADP analyte (due to >80% non-detects) were presented […] View