Research in Progress (RIP) https://rip.trb.org/ en-us Copyright © 2026. National Academy of Sciences. All rights reserved. http://blogs.law.harvard.edu/tech/rss tris-trb@nas.edu (Bill McLeod) tris-trb@nas.edu (Bill McLeod) Research in Progress (RIP) https://rip.trb.org/Images/PageHeader-wTitle-RIP.jpg https://rip.trb.org/ The Effects of Road Types and Construction Activities on Particulate Matter and Development of Best Practices for PM2.5 Reduction https://rip.trb.org/View/2604527 Mon, 29 Sep 2025 16:24:57 GMT https://rip.trb.org/View/2604527 Monitoring and Speciation of Particulate Matter Under 2.5 Microns (PM2.5) Composition across Texas Counties https://rip.trb.org/View/2593191 Tue, 26 Aug 2025 12:42:34 GMT https://rip.trb.org/View/2593191 An Economical and Sustainable Dust Suppressant for Gravel Roads https://rip.trb.org/View/2508967 Wed, 12 Feb 2025 12:37:54 GMT https://rip.trb.org/View/2508967 Curbing Emissions: Enhancing Sustainability Through Collaborative Shipment in Horizontal Supply Chains https://rip.trb.org/View/2420218 Sat, 24 Aug 2024 10:56:54 GMT https://rip.trb.org/View/2420218 Highway Construction Impact on Air Quality https://rip.trb.org/View/2417309 Wed, 14 Aug 2024 14:07:14 GMT https://rip.trb.org/View/2417309 Update ACRP Report 84: Guidebook for Preparing Airport Emissions Inventories for State Implementation Plans https://rip.trb.org/View/2413894 Mon, 05 Aug 2024 17:57:57 GMT https://rip.trb.org/View/2413894 Impact of Freight Activity in and Around Ports https://rip.trb.org/View/2335159 Tue, 06 Feb 2024 16:53:49 GMT https://rip.trb.org/View/2335159 Evaluating Carbon Reduction in Project Selection and Planning https://rip.trb.org/View/2329694 Wed, 31 Jan 2024 17:48:16 GMT https://rip.trb.org/View/2329694 Air Quality Inside Buses https://rip.trb.org/View/2149961 Mon, 10 Apr 2023 17:08:13 GMT https://rip.trb.org/View/2149961 Modeling and Analysis Tools https://rip.trb.org/View/1859214 Tue, 15 Jun 2021 16:34:05 GMT https://rip.trb.org/View/1859214 CMAQ Scenario Testing https://rip.trb.org/View/1662705 Wed, 30 Oct 2019 12:01:51 GMT https://rip.trb.org/View/1662705 ASCENT Project 20 - Development of NAS Wide and Global Rapid Aviation Air Quality https://rip.trb.org/View/1502039 Tue, 13 Feb 2018 11:38:36 GMT https://rip.trb.org/View/1502039 ASCENT Project 19 - Development of Aviation Air Quality Tools for Airport-Specific Impact Assessment https://rip.trb.org/View/1502038 Tue, 13 Feb 2018 11:31:41 GMT https://rip.trb.org/View/1502038 Methods for State DOTs to Reduce Greenhouse Gas Emissions from the Transportation Sector https://rip.trb.org/View/1467498 Fri, 19 May 2017 08:49:25 GMT https://rip.trb.org/View/1467498 CMAQ Performance Plan Phase I https://rip.trb.org/View/1457184 Fri, 24 Feb 2017 13:52:50 GMT https://rip.trb.org/View/1457184