Coal transport: Impact on the biosphere

Dust plumes, diesel fumes and a drained aquifer

What this tab covers Effects on human, animal, plant, fungal and microbial life and on whole ecosystems: in the short term (construction and early years), medium term (operating life) and long term (decommissioning and legacy).

Coal transport's main local harms are dust, diesel exhaust and road traffic. In the past, slurry pipelines also drained aquifers. Its main global harm is enabling coal combustion, which is outside this tile.

Coal dust lost per untreated car (BNSF testimony as reported) up to 645 lb over 400 miles¹³ Coal trains rated 'super-dusters' (Columbia River Gorge study) 5.4% of coal trains, with visible plumes²³ BNSF topping agent trial 1,633 treated trains (2010); results disputed by independent analysts¹⁴ Black Mesa slurry water use about 1.3 billion gallons (about 4,000 acre-feet) a year from the Navajo Aquifer¹²²¹ Deaths per barge-related death, US freight (2001-2019) rail 26, truck 121 (all freight, not coal-specific)¹⁰

Effects over time

Life affected	Short term	Medium term	Long term
Humans²³¹⁵²¹	Construction of rail lines, ports and conveyors displaces land uses	Coal dust and diesel particles near lines (PM2.5 peaks nearly 90% higher for coal trains than other freight trains in a peer-reviewed study); heavy-truck congestion and accidents in mining districts	Loss of groundwater used for drinking (Navajo Aquifer, Black Mesa)
Animals¹³	Little evidence of effect	Little evidence of effect beyond general rail and shipping disturbance	Little evidence of effect
Plants¹³	Clearing for rail loops, stockpiles and conveyor corridors	Dust deposits on vegetation near lines and stockpiles	Little evidence of effect
Fungi and soil life¹³	Little evidence of effect	Coal particles building up in soils near lines	Little evidence of effect
Ecosystems²⁰²¹	Little evidence of effect in the sources used	Water withdrawal for slurry pipelines (about 3,100 to 4,000 acre-feet a year at Black Mesa)	Ship CO2 and black carbon add to climate change

How the effects are reduced

Topping agents, covered wagons, wind fences and water sprays at stockpiles reduce dust. Enclosed pipe conveyors take trucks off rural roads. Locating power plants at the mine, or replacing coal with transmitted electricity, removes the haul altogether. Strict water licensing ended aquifer pumping for slurry. Shipping emissions fall with slower steaming and newer, more efficient ships.

Sources

A modal comparison of domestic freight transportation effects on the general public, 2001-2019 (TTI study, press release) National Waterways Foundation (industry-commissioned), 2022
Black Mesa Coal Mine and Pipeline, Arizona Center for Land Use Interpretation, 2024
Coal dust from trains adds to pollution, new research finds (reports BNSF testimony) KUOW, 2013
Dust up (advocacy analysis of the BNSF and Union Pacific topping agent trial) Sightline Institute, 2014
MAHAGENCO modernises coal transport with closed pipe conveyor network (produced in collaboration with MAHAGENCO) Free Press Journal, 2026
Environmental Impact Statement notice: Black Mesa Project, Arizona (Office of Surface Mining) US Federal Register, 2004
Testimony of Vernon Masayesva on Black Mesa groundwater, House Natural Resources Committee US House of Representatives, 2011
New study shows particulates from coal trains (Jaffe et al., Atmospheric Pollution Research) University of Washington Bothell, 2015