Daily Air Emissions Report

New-Indy continuously monitors hydrogen sulfide levels at the Catawba Mill. The report below shows hydrogen sulfide levels as reported by New-Indy and is updated daily.

Mill Station 1

Report Date: May 19, 2025
  • Concentration Range Detected0 - 16 ppb
  • 24-hr Average1.19 ppb
  • 7-day Average0.66 ppb
  • 30-minute EPA Acute Exposure Guideline Level (AEGL)600 ppb
  • Date of last Reportable Elevated H2S Reading (30-minute average > 600 ppb)September 2, 2021
  • Date of last Reportable Elevated H2S Reading (7-day average > 70 ppb)September 8, 2021

Mill Station 2

Report Date: May 19, 2025
  • Concentration Range Detected0 - 10 ppb
  • 24-hr Average0.54 ppb
  • 7-day Average1.13 ppb
  • 30-minute EPA Acute Exposure Guideline Level (AEGL)600 ppb
  • Date of last Reportable Elevated H2S Reading (30-minute average > 600 ppb)No 30-minute averages > 600 ppb since monitor reporting began on May 26, 2021
  • Date of last Reportable Elevated H2S Reading (7-day average > 70 ppb)No 7-day averages > 70 ppb since monitor reporting began on May 26, 2021

Mill Station 3

Report Date: May 19, 2025
  • Concentration Range Detected0 - 8 ppb
  • 24-hr Average1.36 ppb
  • 7-day Average1.66 ppb
  • 30-minute EPA Acute Exposure Guideline Level (AEGL)600 ppb
  • Date of last Reportable Elevated H2S Reading (30-minute average > 600 ppb)No 30-minute averages > 600 ppb since monitor reporting began on May 26, 2021
  • Date of last Reportable Elevated H2S Reading (7-day average > 70 ppb)No 7-day averages > 70 ppb since monitor reporting began on May 26, 2021

What do the daily graphs from air monitoring stations show? The New-Indy air monitors are stationary instruments that provide data that is averaged over 30-minute periods of time. The onsite instruments measure hydrogen sulfide (H2S) down to four-tenths parts per billion (0.4 ppb). The purpose of the stationary monitors is to provide quantitative information regarding H2S concentrations at New-Indy. The red line in the graphs is set at 70 ppb, which is the 14-day Minimum Risk Level (MRL) for H2S exposure developed by the Agency for Toxic Substances and Disease Registry (ATSDR). An MRL is defined as an estimate of daily exposure to a substance (H2S) that poses a minimal risk of adverse effects to humans over a specified duration of exposure (14 days).

Odor Observation Form

New-Indy has a dedicated phone line for reporting concerns or feedback about our operations. Please call 803.670.2001 and make sure to tell us your name, phone number and the reason for your outreach. If you would like to report an odor observation, please fill out the submission form below. Complete information will enable us to evaluate the issue thoroughly and follow up as needed.

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