Compliance Corner – EPA Updates SO2 Air Quality Standards
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The U.S. Environmental Protection Agency (EPA) announced a revision to the secondary National Ambient Air Quality Standard (NAAQS) for sulfur dioxide (SO2), aimed at enhancing protections for public welfare.
The previous standard of 500 parts per billion (ppb), averaged over a 3-hour period, has been replaced with a more stringent limit of 10 ppb (approximately 26 µg/m³), calculated as an annual average. This significant update reflects EPA's commitment to safeguarding environmental and public health.
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The revised standard was published in the Federal Register on December 27, 2024. For full details, visit the EPA Register here.
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Online AERMOD Training Course – May 13-14, 2025 |
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Register today for our next available 2-day online AERMOD course taking place on May 13 and 14, 2025 from 8:30am to 5:00pm (Central Time – Chicago, USA).
Register now before space is gone!
Note: Due to the immense popularity of our online courses and small class sizes, we recommend registering and making payment as soon as possible to reserve your spot.
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Online CALPUFF Training Course – May 20-21, 2025 – Spots are Filling Fast! |
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Enhance your air dispersion modeling skills by registering for our 2-day online CALPUFF training course taking place on May 20 and 21, 2025 from 8:30am to 5:00pm (Central Time – Chicago, USA).
Space is limited. Register today!
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Just Announced – New Online AERMOD and CALPUFF Courses! |
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We’re excited to announce the following upcoming Online AERMOD and CALPUFF Air Dispersion Modeling Courses. Experience world-class training led by our senior air quality experts—all from the comfort of your home or office.
Online registration is open! Our online courses tend to fill up quickly, so we encourage you to register and complete your payment as soon as possible to secure your spot.
Don’t miss out—sign up today!
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UPCOMING TRAINING COURSES |
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MODELING TIP |
Updates to Upper Air Processing with AERMET 24142 |
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Several months ago, we published a Modeling Tip discussing important changes to processing upper air with the AERMET meteorological preprocessor. Since that time, the U.S. EPA released the 24142 versions of AERMET and other AERMOD modeling system components. This update expanded AERMET’s capabilities for handling the Integrated Global Radiosonde Archive (IGRA) upper air data format, and Lakes Software’s AERMET View Version 13.0 provides further optimization for users.
Users of AERMET View 13.0 will find the following enhancements:
New Base Elevation Field
With the 24142 version, AERMET requires that a Base Elevation value be identified for all upper air stations. This ensures that the ground level can be properly identified even when the IGRA file is missing this value. In AERMET View, the field is found in the Upper Air Station Location group. A warning will be issued if users forget to input this information.
Expanded Upper Air Station Database
AERMET View also features an updated station database using NCEI documentation to populate station information for all global sites (including the newly required Base Elevation field). Simply load any IGRA data file into AERMET View, and the application will automatically apply any relevant information. Users can also manually search the database using the Search Stations button highlighted below.
To access IGRA data, check out our earlier Modeling Tip.
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ENVIRONMENTAL NEWS ARTICLES |
La Niña Is Here |
February 7, 2025 - After seven months of waiting, La Niña—the cooler sister of El Niño—finally showed up in the eastern Pacific Ocean in early December 2024. La Niña may not stick around long, though. According to NOAA, the Pacific may return to neutral conditions in spring 2025.
Read more → |
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Temperature, Rainfall and Tides Speed Glacier Flow on a Daily Basis |
February 5, 2025 - Detailed study of a Greenland glacier’s flow rate reveals the impact of environmental conditions.
Even though ‘glacial’ is commonly used to describe extremely slow, steady movement, a new study has found that glaciers speed up and slow down on a daily – even hourly – basis in response to changes in air temperature, rainfall and the tides.
Read more → |
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UPCOMING CONFERENCES |
2025 Conference Schedule |
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TCEQ Environmental Trade Fair and Conference (ETFC)
June 3-4, 2025 | San Antonio, TX | Booth # 216
Learn more →
Air & Waste Management Association’s 118th Annual Conference & Exhibition
June 9-12, 2025 | Raleigh, NC | Booth # 32 & 33
Learn more →
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LAKES SOFTWARE GROUP OF COMPANIES
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to the sources cited. Organizations cited are in no way affiliated with Lakes Environmental Software.
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