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P2Rx™ Topic Hubs

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Dioxin: Releases to the Atmosphere
Table of Contents
Background and Overview
Releases to the Atmosphere
Dioxin in the Environment
Dioxin in the Food Supply
Health Effects
Regulations & Policies
Dioxin Prevention
Assistance Activities
Where To Go for Help
Complete List of Links

Essential Links:

A Comparison of Dioxin Risk Characterizations
Discusses the composition of dioxin, environmental levels of dioxin, human exposure to dioxin, dioxi...

Database of Sources of Environmental Releases of Dioxin-Like Compounds in the United States
Contains information that tracks dioxin emissions over time, compares profiles between and among sou...

Dioxins and Furans: Where They Come From
Covers how dioxins and furans are produced through manufacturing and burning.

Dioxin is an unintentional by-product of incineration and combustion processes, and can form through natural or manmade processes. Dioxin is emitted naturally through forest fires, composting, and volcanic eruptions. In the 1930s, dioxin levels in the environment began to rise due to the increase in industrial processes. The following incineration processes have historically released dioxin through incinerator ash and gases:
  • trash incinerators
  • hospital waste incinerators
  • hazardous waste incinerators
  • cement kilns burning hazardous wastes
  • sewage sludge incinerators

Polyvinyl chloride (PVC) is the least recyclable type of plastic. Because it is often contaminated with biohazardous waste or is often improperly sorted, it is a large part of the waste stream going into medical waste incinerators. The chlorine contained in PVC and oher wastes in the medical waste stream aid in the formation of dioxins. Another source of dioxin is the chlorinated bleaching process used by pulp and paper mills to produce paper. This process has led to dioxin contamination of air, solid wastes, and bodies of water downstream from the mills. Improvements in controls in recent years have greatly decreased releases of dioxin from medical waste incinerators and pulp and paper processes.

According to the Environmental Protection Agency (EPA), backyard open trash burning is now a major source of dioxin emissions. Backyard burning occurs at low temperatures, in poor smoldering conditions, and in favorable surroundings such as high carbon monoxide levels, all of which contribute to the generation of dioxin emissions.

Source: cfpub.epa.gov/ncea/cfm/dioxindb.cfm?ActType=default

Pesticides, herbicides, and insecticides that use chlorine in their manufacturing processes have all been shown to have traces of dioxins. Some of these products include Agent Orange (banned from military use in 1970), 2,4,5-trichlorophenol (2,4,5-T; banned from use in 1985), Silvex, 2,4-D (commonly used in weed and feed applications for lawn care), and pentachlorophenol. Pentachlorophenols, which are used to preserve wood, can contain relatively high levels of dioxins. Wood treatment facilities and sawmills have been significant sources of contamination, and wastes from these facilities are now treated as hazardous.

Wood burning in industrial facilities (used for electricity and heat) produces dioxin emissions to the air. Facilities that burn wood containing high levels of chlorine have significantly greater levels of dioxin emissions. Power plants, smelters, steel mills, oil and gas refineries, cement kilns, and oil and wood stoves and furnaces all emit dioxins.

Dioxin Emission Sources Over Time (g-TEQ)
Category 1987 & Total 1995 % Total 2002/4 % Total
1-Incineration of: -- -- -- -- -- --
Municipal solid waste 8,877 77 1,250 71 12 32
Medical waste 2,590 22 488 27 7 18
Sewage sludge 6 0.05 14 0.84 14 39
Hazardous waste 5 0.04 5 0.33 3 9
Total incineration 11,478 82 1,758 54 37 3
2-Backyard barrel
604 4 628 19 628 56
3-Metal smelting 955 6 301 9 35 3
4-Cement kilns 131 0.94 173 5 25 2
sewage sludge
76 0.55 76 2 76 6
6-Pulp and paper 372 2.67 23 0.71 15 1
7-Coal-fired utilities 50 0.36 60 1 60 5
8-Industrial wood
26 0.19 27 0.85 27 2
9-Residential wood
89 0.64 62 1 62 5
10-Diesel trucks 27 0.20 35 1 35 3
11-Other 137 0.98 103 3 100 9
TOTAL 13,949 100 3,252 100 1,106 100

Source: cfpub.epa.gov/ncea/cfm/dioxindb.cfm?ActType=default


The Topic Hub™ is a product of the Pollution Prevention Resource Exchange (P2Rx)

The Dioxin Topic Hub™ was developed by:

Northeast Waste Management Officials' Association
Northeast Waste Management Officials' Association
Contact email: abray@newmoa.org

Hub Last Updated: 10/8/2013