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PUBLIC HEALTH STATEMENT 

SULFUR TRIOXIDE and SULFURIC ACID 

CAS#: Sulfur Trioxide 7446-11-9 

Sulfuric Acid 7664-93-9 

Division of Toxicology December 1998 

This Public Health Statement is the summary 

chapter from the Toxicological Profile for Sulfur 

Trioxide and Sulfuric Acid. It is one in a series of 

Public Health Statements about hazardous 

substances and their health effects. A shorter 

version, the ToxFAQsTM, is also available. This 

information is important because this substance may 

harm you. The effects of exposure to any hazardous 

substance depend on the dose, the duration, how 

you are exposed, personal traits and habits, and 

whether other chemicals are present. For more 

information, call the ATSDR Information Center at 

1-888-422-8737. 

______________________________________ 

This public health statement tells you about sulfur 

trioxide and sulfuric acid and the effects of 

exposure. 

The Environmental Protection Agency (EPA) 

identifies the most serious hazardous waste sites in 

the nation. These sites make up the National 

Priorities List (NPL) and are the sites targeted for 

long-term federal cleanup. Sulfur trioxide and 

sulfuric acid have been found in at least 47 of the 

1,467 current or former NPL sites. As more sites 

are evaluated, the sites with sulfur trioxide or 

sulfuric acid may increase. This is important 

because exposure to these substances may harm you 

and because these sites may be sources of exposure. 

When a substance is released from a large area, 

such as an industrial plant, or from a container, such 

as a drum or bottle, it enters the environment. This 

release does not always lead to exposure. You are 

exposed to a substance only when you come in 

contact with it. You may be exposed by breathing, 

eating, or drinking the substance or by skin contact. 

If you are exposed to sulfur trioxide or sulfuric acid, 

many factors determine whether you'll be harmed. 

These factors include the dose (how much), the 

duration (how long), and how you come in contact 

with it. You must also consider the other chemicals 

you're exposed to and your age, sex, diet, family 

traits, lifestyle, and state of health. 

1.1 WHAT ARE SULFUR TRIOXIDE AND 

SULFURIC ACID? 

Sulfur trioxide is generally a colorless liquid but can 

also exist as ice- or fiber-like crystals or as a gas. 

When sulfur trioxide is exposed to air, it rapidly 

takes up water and gives off white fumes. It 

combines with water, releasing considerable heat 

while forming sulfuric acid. It also reacts violently 

with some metal oxides. Sulfur trioxide is also 

called sulfuric oxide and sulfuric anhydride. It is 

used as an intermediate in the production of sulfuric 

acid, other chemicals, and explosives. Sulfur 

trioxide is unlikely to exist in the environment 

except for very short periods when it may be 

present in the air as a gas. In the air, sulfur trioxide 

can be formed slowly from sulfur dioxide. Once 

formed, sulfur trioxide will react with water in the 

air to form sulfuric acid. Both sulfur dioxide and 

sulfuric acid are more likely to be found in air than 

sulfur trioxide. If you are interested in learning 

more about sulfur dioxide, the Agency for Toxic 

Substances and Disease Registry has developed a 

separate profile about it. 

Sulfuric acid is a clear, colorless, oily liquid that is 

very corrosive. An odor threshold of sulfuric acid 

in air has been reported to be 1 milligram per cubic 

meter of air (mg/m3). If you are exposed to 

concentrated sulfuric acid in air, your nose will be 

DEPARTMENT of HEALTH AND HUMAN SERVICES, Public Health Service
 

Agency for Toxic Substances and Disease Registry 

www.atsdr.cdc.gov/ Telephone: 1-888-422-8737 Fax: 770-488-4178 E-Mail: atsdric@cdc.gov 
 

 

 

 

 

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PUBLIC HEALTH STATEMENT 

SULFUR TRIOXIDE and SULFURIC ACID 

CAS#: Sulfur Trioxide 7446-11-9 

Sulfuric Acid 7664-93-9 

Division of Toxicology December 1998 

irritated and it may seem like sulfuric acid has a 

pungent odor. When concentrated sulfuric acid is 

mixed with water, the solution gets very hot. 

Concentrated sulfuric acid can catch fire or explode 

when it comes into contact with many chemicals 

including acetone, alcohols, and some finely 

divided metals. When heated it emits highly toxic 

fumes, which include sulfur trioxide. It is also 

called sulphine acid, battery acid, and hydrogen 

sulfate. More sulfuric acid is produced in the 

United States than any other chemical. It is used in 

the manufacture of fertilizers, explosives, other 

acids, and glue; in the purification of petroleum; in 

the pickling of metal; and in lead-acid batteries (the 

type commonly used in motor vehicles). Sulfuric 

acid can be found in the air as small droplets or it 

can be attached to other small particles in the air. 

Fuming sulfuric acid, also called oleum, is a 

solution of 10–70% sulfur trioxide in sulfuric acid. 

Oleum is the form of sulfuric acid that is often 

shipped in railroad cars. 

1.2 WHAT HAPPENS TO SULFUR TRIOXIDE 

AND SULFURIC ACID WHEN THEY 

ENTER THE ENVIRONMENT? 

Much of the sulfuric acid in the air is formed from 

sulfur dioxide released when coal, oil, and gas are 

burned. The released sulfur dioxide slowly forms 

sulfur trioxide, which reacts with water in the air to 

form sulfuric acid. Sulfuric acid dissolves in the 

water in air and can remain suspended for varying 

periods of time; it is removed from the air as rain. 

Sulfuric acid in rain contributes to the formation of 

acid rain. Sulfuric acid in water separates to form 

hydrogen ions and sulfate. The ability of sulfuric 

acid to change the acidity (pH) of water is 

dependent on the amount of sulfuric acid and the 

ability of other substances in the water to neutralize 

the hydrogen ions (buffering capacity). 

1.3 HOW MIGHT I BE EXPOSED TO 

SULFUR TRIOXIDE AND SULFURIC 

ACID? 

You may be exposed to sulfur trioxide or sulfuric 

acid at your job if you work in the chemical or 

metal plating industry; if you produce detergents, 

soaps, fertilizers, or lead-acid batteries; or if you 

work in printing and publishing, or photography 

shops. Because sulfur trioxide forms sulfuric acid 

when it contacts the moist surfaces of your 

respiratory tract or your skin, the effects caused by 

sulfur trioxide and sulfuric acid are similar. In 

occupational settings, breathing small droplets of 

sulfur trioxide or sulfuric acid or touching it with 

your skin are the most likely ways you would be 

exposed to sulfuric acid. According to estimates 

from a survey conducted by the National Institute 

for Occupational Safety and Health (NIOSH) more 

than 56,103 U.S. workers may be exposed to sulfur 

trioxide, and more than 775,348 U.S. workers may 

be exposed to sulfuric acid. However, this survey 

used estimates from small samples, so the number 

of workers exposed to sulfur trioxide and sulfuric 

acid may be overestimated. 

You may also be exposed to sulfuric acid by 

breathing outdoor air containing this compound. As 

mentioned before, sulfuric acid droplets can form in 

the air when sulfur dioxide is released from the 

burning of coal, oil, and gas. This released sulfur 

dioxide slowly forms sulfur trioxide and then reacts 

with water in the air to form sulfuric acid. While 

sulfuric acid could be present in the air during 

DEPARTMENT of HEALTH AND HUMAN SERVICES, Public Health Service
 

Agency for Toxic Substances and Disease Registry 

www.atsdr.cdc.gov/ Telephone: 1-888-422-8737 Fax: 770-488-4178 E-Mail: atsdric@cdc.gov 
 

 

 

 

 

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PUBLIC HEALTH STATEMENT 

SULFUR TRIOXIDE and SULFURIC ACID 

CAS#: Sulfur Trioxide 7446-11-9 

Sulfuric Acid 7664-93-9 

Division of Toxicology December 1998 

episodes of high pollution, all air pollution is not 

due to sulfuric acid contamination. The effects of 

other pollutants in air may be of greater concern to 

the general population. Likewise, there are 

relatively few sulfuric acid air pollution episodes 

today. 

People living near hazardous waste sites that 

contain sulfuric acid are at greater risk of exposure 

by breathing contaminated air than is the general 

public. For these people, spending time outdoors, 

especially exercising, could increase their risks of 

being exposed. 

You can also be exposed to sulfuric acid when you 

touch the material that forms on the outside of your 

car battery. Sulfuric acid is formed when some 

toilet bowl cleaners mix with water. Therefore, if 

these products touch skin or are accidentally 

swallowed, you could be exposed to sulfuric acid. 

When you cut onions a chemical called 

propanethiol S-oxide is released into the air. When 

this chemical reaches your eyes, it reacts with the 

water in your eyes to form sulfuric acid, which 

causes your eyes to water. People have also been 

exposed following accidental spills of sulfuric acid 

or oleum. These accidents occurred more 

frequently at a site than while the substances were 

being transported. 

1.4 HOW CAN SULFUR TRIOXIDE AND 

SULFURIC ACID ENTER AND LEAVE 

MY BODY? 

If you breathe in sulfur trioxide, small droplets of 

sulfuric acid will form when the sulfur trioxide 

contacts water. Small droplets of sulfuric acid may 

also enter the respiratory tract when you breathe. 

Where the droplets will deposit in the respiratory 

tract depends on their size and how deeply you are 

breathing. Smaller droplets will deposit deeper into 

the lung. If you breathe through your mouth, more 

droplets will deposit in your lungs than if you 

breathe only through your nose. Extra sulfur 

dioxide breakdown products are excreted in the 

urine. 

Sulfuric acid causes its effects by direct action on 

tissues that it touches. With the exception of how 

sulfuric acid droplets deposit in the lungs, how 

sulfur trioxide and sulfuric acid enter and leave your 

body does not alter the effects of sulfuric acid. 

1.5 HOW CAN SULFUR TRIOXIDE AND 

SULFURIC ACID AFFECT MY HEALTH? 

To protect the public from the harmful effects of 

toxic chemicals and to find ways to treat people 

who have been harmed, scientists use many tests. 

One way to see if a chemical will hurt people is to 

learn how the chemical is absorbed, used, and 

released by the body; for some chemicals, animal 

testing may be necessary. Animal testing may also 

be used to identify health effects such as cancer or 

birth defects. Without laboratory animals, scientists 

would lose a basic method to get information 

needed to make wise decisions to protect public 

health. Scientists have the responsibility to treat 

research animals with care and compassion. Laws 

today protect the welfare of research animals, and 

scientists must comply with strict animal care 

guidelines. 

Sulfuric acid and other acids are very corrosive and 

irritating and cause direct local effects on the skin, 

DEPARTMENT of HEALTH AND HUMAN SERVICES, Public Health Service
 

Agency for Toxic Substances and Disease Registry 

www.atsdr.cdc.gov/ Telephone: 1-888-422-8737 Fax: 770-488-4178 E-Mail: atsdric@cdc.gov 
 

 

 

 

 

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PUBLIC HEALTH STATEMENT 

SULFUR TRIOXIDE and SULFURIC ACID 

CAS#: Sulfur Trioxide 7446-11-9 

Sulfuric Acid 7664-93-9 

Division of Toxicology December 1998 

eyes, and respiratory and gastrointestinal tracts 

when there is direct exposure to sufficient 

concentrations. Breathing sulfuric acid mists can 

result in tooth erosion and respiratory tract 

irritation. Drinking concentrated sulfuric acid can 

burn your mouth and throat, and it can erode a hole 

in your stomach; it has also resulted in death. If you 

touch sulfuric acid, it will burn your skin. If you 

get sulfuric acid in your eyes, it will burn your eyes 

and cause them to water. The term "burn" used in 

these sections refers to a chemical burn, not a 

physical burn resulting from contacting a hot object. 

People have been blinded by sulfuric acid when it 

was thrown in their faces. 

Breathing small droplets of sulfuric acid at levels 

that might be in the air on a day with high air 

pollution may make it more difficult to breathe. 

This effect is more likely to occur if you have been 

exercising or if you have asthma. This effect may 

also be more likely to occur in children than adults. 

Breathing sulfuric acid droplets may affect the 

ability of your respiratory tract to remove other 

small particles that you have inhaled. If you breathe 

sulfur trioxide, it turns into sulfuric acid in your 

upper respiratory tract, and the effects you may 

experience will be similar to those of sulfuric acid 

inhalation. 

Studies in people who breathed high concentrations 

of sulfuric acid at work have shown an increase in 

cancers of the larynx. However, most of the 

cancers were in smokers who were also exposed to 

other acids and other chemicals. There is no 

information that exposure to sulfuric acid by itself is 

carcinogenic. The carcinogenicity of sulfuric acid 

has not been studied in animals. The EPA and the 

U.S. Department of Health and Human Services 

(DHHS) have not classified sulfur trioxide or 

sulfuric acid for carcinogenic effects. Based on 

very limited human data, the International Agency 

for Research on Cancer (IARC) believes that 

evidence is sufficient to state that occupational 

exposure to strong inorganic acid mists containing 

sulfuric acid is carcinogenic to humans. IARC has 

not classified pure sulfuric acid for its carcinogenic 

effects. 

1.6 HOW CAN SULFUR TRIOXIDE AND 

SULFURIC ACID AFFECT CHILDREN? 

This section discusses potential health effects from 

exposures during the period from conception to 

maturity at 18 years of age in humans. Potential 

effects on children resulting from exposures of the 

parents are also considered. 

Children may be exposed to sulfur trioxide and 

sulfuric acid in the same manner as adults, with the 

exception of chemical encounters in the workplace. 

Sulfur trioxide is only used in industry as an 

intermediate in the production of chemicals such as 

sulfuric acid and quickly converts to sulfuric acid 

when it contacts water in air. Therefore, children 

will most likely only be at risk of exposure from 

sulfuric acid, not sulfur trioxide. Exposure to 

sulfuric acid may occur through skin contact, eye 

contact, ingestion, and breathing contaminated air. 

Sulfuric acid can cause severe skin burns, it can 

burn the eyes, burn holes in the stomach if 

swallowed, irritate the nose and throat, and cause 

difficulties breathing if inhaled. 

Exposure to sulfuric acid from accidental contact 

with or misuse of sulfuric acid-containing consumer 

products is the most likely way your child could be 

DEPARTMENT of HEALTH AND HUMAN SERVICES, Public Health Service
 

Agency for Toxic Substances and Disease Registry 

www.atsdr.cdc.gov/ Telephone: 1-888-422-8737 Fax: 770-488-4178 E-Mail: atsdric@cdc.gov 
 

 

 

 

 

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PUBLIC HEALTH STATEMENT 

SULFUR TRIOXIDE and SULFURIC ACID 

CAS#: Sulfur Trioxide 7446-11-9 

Sulfuric Acid 7664-93-9 

Division of Toxicology December 1998 

exposed. Household products that contain sulfuric 

acid include drain and toilet bowl cleaners, and 

some acid car batteries. The national estimate 

(derived by United States Consumer Product Safety 

Commission, USCPSC) for injuries related to drain 

cleaners over a 5-year period ending January 1996 

is between 2,800 and 3,150 injuries per year. 

Inquisitive toddlers may get into unsealed or 

improperly stored containers of sulfuric acidcontaining products. Transfer of cleaning agents 

containing sulfuric acid into containers not designed 

for their storage can allow leakage from the 

container. Improper flushing of areas recently 

cleaned with a sulfuric acid-containing product can 

lead to inadvertent skin exposure to both children 

and adults. 

While younger children are most at risk from 

accidental swallowing, skin contact, or eye contact 

with sulfuric acid in household products, teenagers 

might have jobs in which they may contact sulfuric 

acid. If teenagers must use acid cleaners in their 

jobs or work in car repair where they may contact 

car batteries, they might be exposed. Furthermore, 

there have been reports of older children using 

sulfuric acid-containing solutions as weapons, 

thereby causing severe skin damage when 

intentionally splashed on others. 

Small droplets of sulfuric acid may exist in the 

outdoor air. You and your children have the 

greatest chances of inhaling the compound during 

times of high air pollution with sulfuric acid. This 

may lead to difficulty breathing. If you live near 

electrical, metal processing, or paper processing 

industries, you may also have a greater chance of 

exposure to sulfuric acid. When sulfuric acid is 

inhaled into the lungs in the form of small droplets 

that exist in air, these droplets are deposited within 

the lung and the ability of your respiratory tract to 

remove other small, unwanted particles may be 

decreased. A study has shown that children can 

have greater deposition of sulfuric acid in their 

lungs than adults due to children's smaller airway 

diameters. Also, because children breathe more air 

per kilogram of body weight than adults, children 

may take in more sulfuric acid when they breathe 

the same contaminated air. Increased sensitivity has 

been witnessed in both animal studies with young 

guinea pigs and in human studies of asthmatic 

adolescents. This evidence suggests that children 

may be more vulnerable than adults to the health 

effects associated with breathing sulfuric acid. 

No studies examining effects on unborn children 

following a mother's exposure to sulfuric acid 

during pregnancy were identified in humans. 

Limited evidence in animals indicates that sulfuric 

acid is not a hazard to unborn children. Birth 

defects have not been observed in animals that 

breathed high levels of sulfuric acid mist. Exposing 

pregnant rabbits to sulfuric acid did not 

significantly affect the body weights or cause 

malformations in their offspring. Again, because 

sulfuric acid causes adverse effects at its point of 

contact with the body, the acid, as such, is not 

expected to be absorbed or distributed throughout 

the body. Sulfuric acid is not expected to be 

transported across a mother's placenta into her 

developing baby or into breast milk. Therefore, an 

exposed mother most likely will not threaten her 

unborn or nursing child. Since sulfuric acid's 

effects occur at the point of contact, it is not likely 

that it will reach a mother's egg or father's sperm. 

Therefore, parents exposure to sulfuric acid or 

DEPARTMENT of HEALTH AND HUMAN SERVICES, Public Health Service
 

Agency for Toxic Substances and Disease Registry 

www.atsdr.cdc.gov/ Telephone: 1-888-422-8737 Fax: 770-488-4178 E-Mail: atsdric@cdc.gov 
 

 

 

 

 

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PUBLIC HEALTH STATEMENT 

SULFUR TRIOXIDE and SULFURIC ACID 

CAS#: Sulfur Trioxide 7446-11-9 

Sulfuric Acid 7664-93-9 

Division of Toxicology December 1998 

sulfur trioxide should not affect their unborn 

children. 

1.7 HOW CAN FAMILIES REDUCE THE 

RISK OF EXPOSURE TO SULFUR 

TRIOXIDE AND SULFURIC ACID? 

If your doctor finds that you have been exposed to 

significant amounts of sulfur trioxide or sulfuric 

acid, ask if children may also be exposed. When 

necessary your doctor may need to ask your State 

Department of Public Health to investigate. 

Sulfuric acid is a highly corrosive chemical that is 

potentially explosive in concentrated form. It can 

cause severe skin burns, can irritate the nose and 

throat and cause difficulties breathing if inhaled, 

can burn the eyes and possibly cause blindness, and 

can burn holes in the stomach if swallowed. 

Concentrated sulfuric acid is commonly used in the 

United States as a drain and toilet bowl cleaner. 

Children and adults have suffered full thickness 

skin burns upon accidental contact or intentional 

assault with sulfuric acid in this form. Additionally, 

sulfuric acid is formed when some toilet bowl 

cleaners mix with water, so care should be taken not 

to breathe associated vapors or splash any liquid on 

the skin or in the eyes. All household chemicals 

containing sulfuric acid should be stored in their 

original, labeled containers, kept in locked cabinets 

away from children, kept away from fire, and 

should be used only for their intended purposes. 

The material that forms on the outside of a car 

battery is also a source of sulfuric acid and you 

should avoid touching it. Wear safety glasses and 

use chemical resistant gloves to avoid this type of 

exposure. Upon any exposure to sulfuric acid, the 

contacted body part should be immediately flushed 

with plentiful water and then the Poison Control 

Center contacted. Keep your Poison Control 

Center's number by the phone. If sulfuric acid is 

spilled in the home, the local Fire Department 

should be contacted for assistance in handling the 

spill. 

When levels of air pollution are high, families are 

advised to stay indoors as much as possible and to 

avoid exercising outdoors. Families can be aware 

of levels of air pollution by paying attention to news 

bulletins and air pollution advisories, most of which 

are issued by the EPA (Environmental Protection 

Agency). This is particularly important for 

individuals with respiratory conditions and 

asthmatic children. Staying indoors during times of 

sulfuric acid air pollution will help you avoid 

breathing sulfuric acid droplets. 

Adults may be occupationally exposed to sulfuric 

acid if they work in the chemical or metal plating 

industry; produce detergents, soaps, fertilizers, or 

lead-acid batteries; or work in printing or 

publishing, or photography shops. It is not 

anticipated that workers in such industries can 

expose their families at home (through their 

clothing, skin, or breath) to sulfuric acid contacted 

at work. 

1.8 IS THERE A MEDICAL TEST TO 

DETERMINE WHETHER I HAVE BEEN 

EXPOSED TO SULFUR TRIOXIDE AND 

SULFURIC ACID? 

There is no medical test to determine whether you 

have been exposed to sulfur trioxide or sulfuric 

acid. Breathing in acids, including sulfuric acid, 

DEPARTMENT of HEALTH AND HUMAN SERVICES, Public Health Service
 

Agency for Toxic Substances and Disease Registry 

www.atsdr.cdc.gov/ Telephone: 1-888-422-8737 Fax: 770-488-4178 E-Mail: atsdric@cdc.gov 
 

 

 

 

 

__________________________________________________________________________________________ 

 

 

 

PUBLIC HEALTH STATEMENT 

SULFUR TRIOXIDE and SULFURIC ACID 

CAS#: Sulfur Trioxide 7446-11-9 

Sulfuric Acid 7664-93-9 

Division of Toxicology December 1998 

will increase the acidity of your saliva. Measuring 

the acidity of saliva may determine whether you 

have been exposed to acid but cannot determine 

which acid. 

1.9 WHAT RECOMMENDATIONS HAS THE 

FEDERAL GOVERNMENT MADE TO 

PROTECT HUMAN HEALTH? 

The federal government develops regulations and 

recommendations to protect public health. 

Regulations can be enforced by law. Federal 

agencies that develop regulations for toxic 

substances include the Environmental Protection 

Agency (EPA), the Occupational Safety and Health 

Administration (OSHA), and the Food and Drug 

Administration (FDA). Recommendations provide 

valuable guidelines to protect public health but 

cannot be enforced by law. Federal organizations 

that develop recommendations for toxic substances 

include the Agency for Toxic Substances and 

Disease Registry (ATSDR) and the National 

Institute for Occupational Safety and Health 

(NIOSH). 

Regulations and recommendations can be expressed 

in not-to-exceed levels in air, water, soil, or food 

that are usually based on levels that affect animals; 

then they are adjusted to help protect people. 

Sometimes these not-to-exceed levels differ among 

federal organizations because of different exposure 

times (an 8-hour workday or a 24-hour day), the use 

of different animal studies, or other factors. 

Recommendations and regulations are also 

periodically updated as more information becomes 

available. For the most current information, check 

with the federal agency or organization that 

provides it. Some regulations and 

recommendations for sulfur trioxide and sulfuric 

acid include the following: 

EPA limits the amount of sulfur dioxide that can be 

released into the air. This limits the amount of 

sulfur trioxide and sulfuric acid that form from 

sulfur dioxide in the air. 

OSHA limits the amount of sulfuric acid that can be 

present in workroom air to 1 mg/m3. NIOSH also 

recommends a time-weighted average limit of 1 

mg/m3. 

1.10 WHERE CAN I GET MORE 

INFORMATION? 

If you have any more questions or concerns, please 

contact your community or state health or 

environmental quality department or: 

Agency for Toxic Substances and Disease Registry 

Division of Toxicology 

1600 Clifton Road NE, Mailstop F-32 

Atlanta, GA 30333 

Information line and technical assistance: 

Phone: 888-422-8737 

FAX: (770)-488-4178 

ATSDR can also tell you the location of 

occupational and environmental health clinics. 

These clinics specialize in recognizing, evaluating, 

and treating illnesses resulting from exposure to 

hazardous substances. 

DEPARTMENT of HEALTH AND HUMAN SERVICES, Public Health Service
 

Agency for Toxic Substances and Disease Registry 

www.atsdr.cdc.gov/ Telephone: 1-888-422-8737 Fax: 770-488-4178 E-Mail: atsdric@cdc.gov 
 

 

 

 

 

__________________________________________________________________________________________ 

 

 

PUBLIC HEALTH STATEMENT 

SULFUR TRIOXIDE and SULFURIC ACID 

CAS#: Sulfur Trioxide 7446-11-9 

Sulfuric Acid 7664-93-9 

Division of Toxicology December 1998 

To order toxicological profiles, contact: 

National Technical Information Service 

5285 Port Royal Road 

Springfield, VA 22161 

Phone: 800-553-6847 or 703-605-6000 

Reference 

Agency for Toxic Substances and Disease Registry 

(ATSDR). 1998. Toxicological profile for sulfur 

trioxide and sulfuric acid. Atlanta, GA: U.S. 

Department of Health and Human Services, Public 

Health Service. 

DEPARTMENT of HEALTH AND HUMAN SERVICES, Public Health Service
 

Agency for Toxic Substances and Disease Registry 

www.atsdr.cdc.gov/ Telephone: 1-888-422-8737 Fax: 770-488-4178 E-Mail: atsdric@cdc.gov