This data set contains continuous UV photometric data of surface level ozone collected at 6m above ground level. Data records consist of UTC time, date, and processed ozone mixing ratio (parts per billion). Data is collected from global locations and is provided in 1 minute and 1 hour averages. The data were produced and are available from the NOAA Earth System Research Laboratory (ESRL) Global Monitoring Laboratory, and the data are archived by the NOAA National Centers for Environmental Information (NCEI).

The Ozone and Water Vapor Group is part of NOAA's Global Monitoring Laboratory (GML) in Boulder, CO. The Ozone Water Vapor Group conducts research on the nature and causes of the depletion of the stratospheric ozone layer and the role of stratospheric and tropospheric ozone and water vapor in forcing climate change and in modifying the chemical cleaning capacity of the atmosphere. This is accomplished through long-term observations and intensive field programs that measure ozone and water vapor levels in the upper troposphere and stratosphere. The Reference Network used by the Ozone and Water Vapor Group is also part of NOAA's GML. The measurement programs include Total Column Ozone Measurements (Dobson Ozone), Surface Ozone Measurements, Ozonesonde Measurements using balloons, and Water Vapor measurements using balloons. The Dobson Ozone Spectrophotometer has been used to study total ozone since it was developed in the 1920's. Total ozone is the total amount of ozone in a column from the surface to the edge of the atmosphere. The use of the Dobson Ozone Spectrophotometer is important to the global effort to understand the role of stratospheric ozone in atmospheric chemistry, biological and ecological effects of solar UV radiation, climate and weather. NOAA's Global Monitoring Laboratory maintains stations around the world that use the Dobson Ozone spectrophotometer. These stations are located in American Samoa, Antarctica, Australia, France, New Zealand, and the United States (Alaska, California, Colorado, Hawaii, Maine, North Dakota, Tennessee, and Virginia). They are also the World Dobson Ozone Calibration Centre, responsible for the calibration of over 100 instruments worldwide.

The Ozone and Water Vapor Group is part of NOAA's Earth System Research Laboratory (ESRL) in Boulder, CO. The Ozone Water Vapor Group conducts research on the nature and causes of the depletion of the stratospheric ozone layer and the role of stratospheric and tropospheric ozone and water vapor in forcing climate change and in modifying the chemical cleaning capacity of the atmosphere. This is accomplished through long-term observations and intensive field programs that measure ozone and water vapor levels in the upper troposphere and stratosphere. The Reference Network used by the Ozone and Water Vapor Group is part of NOAA's Earth System Research Laboratory in Boulder, CO. The measurement programs include Total Column Ozone Measurements (Dobson Ozone), Surface Ozone Measurements, Ozonesonde Measurements using balloons, and Water Vapor measurements using balloons. The Dobson Ozone Spectrophotometer has been used to study total ozone since it was developed in the 1920's. Total ozone is the total amount of ozone in a column from the surface to the edge of the atmosphere. The use of the Dobson Ozone Spectrophotometer is important to the global effort to understand the role of stratospheric ozone in atmospheric chemistry, biological and ecological effects of solar UV radiation, climate and weather. ESRL Global Monitoring Division maintains stations around the world that use the Dobson Ozone spectrophotometer. These stations are located in American Samoa, Antarctica, Australia, France, New Zealand, and the United States (Alaska, California, Colorado, Hawaii, Maine, North Dakota, Tennessee, and Virginia). They are also the World Dobson Ozone Calibration Centre, responsible for the calibration of over 100 instruments worldwide.

LMOS_TraceGas_ShipInSitu_Data_1 is the Lake Michigan Ozone Study (LMOS) in-situ trace gas data collected onboard the NOAA Research Vessel during the LMOS field campaign. This product is a result of a joint effort across multiple agencies, including NASA, NOAA, the EPA, Electric Power Research Institute (EPRI), National Science Foundation (NSF), Lake Michigan Air Directors Consortium (LADCO) and its member states, and several research groups at universities. Data collection is complete.Elevated spring and summertime ozone levels remain a challenge along the coast of Lake Michigan, with a number of monitors exceeding the 2015 National Ambient Air Quality Standards (NAAQS) for ozone. The production of ozone over Lake Michigan, combined with onshore daytime “lake breeze” airflow is believed to increase ozone concentrations at locations within a few kilometers of the shore. This observed lake-shore gradient motivated the Lake Michigan Ozone Study (LMOS). Conducted from May through June 2017, the goal of LMOS was to better understand ozone formation and transport around Lake Michigan; in particular, why ozone concentrations are generally highest along the lakeshore and drop off sharply inland and why ozone concentrations peak in rural areas far from major emission sources. LMOS was a collaborative, multi-agency field study that provided extensive observational air quality and meteorology datasets through a combination of airborne, ship, mobile laboratories, and fixed ground-based observational platforms. Chemical transport models (CTMs) and meteorological forecast tools assisted in planning for day-to-day measurement strategies. The long term goals of the LMOS field study were to improve modeled ozone forecasts for this region, better understand ozone formation and transport around Lake Michigan, provide a better understanding of the lakeshore gradient in ozone concentrations (which could influence how the Environmental Protection Agency (EPA) addresses future regional ozone issues), and provide improved knowledge of how emissions influence ozone formation in the region.

These data include three-dimensional meteorological (WRF) and air quality (CMAQ) model output for 4-km and 2-km domains covering the San Joaquin Valley (SJV) of California for January and February of 2013. The WRF and CMAQ parameters used in the analysis presented in the research effort are listed in the attached spreadsheet. The WRF/CMAQ data themselves are located on EPA's asm tape archive in the directories below. These data are available upon request from the authors, specifically K. Wyat Appel (appel.wyat@epa.gov). /asm/MOD3EVAL/DISCOVERAQ/SJV/DISCOVERAQ_SJV_4km_CMAQv52_Jul19_CB6_NewEmis /asm/MOD3EVAL/DISCOVERAQ/SJV/output_sf_SJV_2km_CMAQv52_CB6_Jul192017rel_NewEmis. This dataset is associated with the following publication: Choi, S., L. Lok, J. Joiner, N. Krotkov, M. Follette-Cook, W. Swartz, K. Pickering, C. Loughner, K.W. Appel, G. Pfister, P. Saide, R. Cohen, A. Weinheimer, and J. Herman. Assessment of NO2 Observations during DISCOVER-AQ and KORUS-AQ Field Campaigns. Atmospheric Measurement Techniques. Copernicus Publications, Katlenburg-Lindau, GERMANY, 13(5): 2523–2546, (2020).

These data include three-dimensional meteorological (WRF) and air quality (CMAQ) model output for 4-km and 2-km domains covering the San Joaquin Valley (SJV) of California for January and February of 2013. The WRF and CMAQ parameters used in the analysis presented in the research effort are listed in the attached spreadsheet. The WRF/CMAQ data themselves are located on EPA's asm tape archive in the directories below. These data are available upon request from the authors, specifically K. Wyat Appel (appel.wyat@epa.gov). /asm/MOD3EVAL/DISCOVERAQ/SJV/DISCOVERAQ_SJV_4km_CMAQv52_Jul19_CB6_NewEmis /asm/MOD3EVAL/DISCOVERAQ/SJV/output_sf_SJV_2km_CMAQv52_CB6_Jul192017rel_NewEmis. This dataset is associated with the following publication: Choi, S., L. Lok, J. Joiner, N. Krotkov, M. Follette-Cook, W. Swartz, K. Pickering, C. Loughner, K.W. Appel, G. Pfister, P. Saide, R. Cohen, A. Weinheimer, and J. Herman. Assessment of NO2 Observations during DISCOVER-AQ and KORUS-AQ Field Campaigns. Atmospheric Measurement Techniques. Copernicus Publications, Katlenburg-Lindau, GERMANY, 13(5): 2523–2546, (2020).

The dataset was created by University of Houston. For details, please contact Jia Jung at helloiamjia@gmail.com. This dataset is associated with the following publication: Jung, J., Y. Choi, S. Mousavinezhad, D. Kang, J. Park, A. Pouyaei, M. Ghahremanloo, M. Momeni, and H. Kim. Changes in the ozone chemical regime over the contiguous United States inferred by the inversion of NOx and VOC emissions using satellite observation. Atmospheric Research. Elsevier Science BV, Amsterdam, NETHERLANDS, 270: 106076, (2022).