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Pesticides are designed to kill
"pests", but some pesticides can also cause health effects in people.
The likelihood of developing health effects depends on the type of pesticide
and other chemicals that are in the product you are using, as well as the
amount you are exposed to and how long or often you are exposed.
Most often, pesticides affect
the nervous system (system in your body that controls your nerves and muscles).
General health effects from acute (short-term) exposures or poisonings are
listed in the table below.
NOTE: The term "pesticide"
describes a very large and diverse group of chemicals or products. It is very
important to always get specific information about the exact product you are
using.
Table
General Symptoms that Might Indicate Pesticide Poisoning |
||
Mild Poisoning
|
Moderate Poisoning
|
Severe Poisoning
|
Any of the following:
·
irritation of the nose,
throat, eyes or skin
·
headache
·
dizziness
·
loss of appetite
·
thirst
·
nausea
·
diarrhea
·
sweating
·
weakness or fatigue
·
restlessness
·
nervousness
·
changes in mood
·
insomnia
|
Any of the mild symptoms,
plus any of the following:
·
vomiting
·
excessive salivation
·
coughing
·
feeling of constriction in
throat and chest
·
abdominal cramps
·
blurring of vision
·
rapid pulse
·
excessive perspiration
·
profound weakness
·
trembling
·
muscular incoordination
·
mental confusion
|
Any of the mild or moderate
symptoms, plus any of the following:
·
inability to breathe
·
extra phlegm or mucous in the
airways
·
small or pinpoint pupils
·
chemical burns on the skin
·
increased rate of breathing
·
loss of reflexes
·
uncontrollable muscular
twitching
·
unconsciousness
·
death
|
Some health effects from
pesticide exposure may occur right away, as you are being exposed. Some
symptoms may occur several hours after exposure. Other effects may not be
noticed for years, for example cancer.
Some symptoms of pesticide
exposure will go away as soon as the exposure stops. Others may take some time
to go away. For people exposed to pesticides on a regular basis, long-term
health effects are a concern.
Women who are pregnant or
breast-feeding should check with their doctors before working with pesticides
as some pesticides may be harmful to the fetus (unborn baby) or to breast-fed
infants.
Certified pesticide applicators
or people who work with pesticides are encouraged to have regular medical
check-ups. Tell your doctor which pesticides you are working with and/or
exposed to.
How
do pesticides enter our bodies?
Pesticides can enter your body during mixing, applying, or
clean-up operations. There are generally three ways a chemical or material can
enter the body:
·
through the skin (dermal),
·
through the lungs (inhalation),
or
·
by mouth (ingestion).
Dermal (absorption through skin)
In most work situations,
absorption through the skin is the most common route of pesticide exposure.
People can be exposed to a splash or mist when mixing, loading or applying the
pesticide. Skin contact can also occur when you touch a piece of equipment,
protective clothing, or surface that has pesticide residue on it.
Inhalation (through the lungs)
Inhalation may occur when working
near powders, airborne droplets (mists) or vapours. The hazard from
low-pressure applications is fairly low because most of the droplets are too
large to remain in the air. Applying a pesticide with high pressure, ultra low
volume, or fogging equipment can increase the hazard because the droplets are
smaller and they can be carried in the air for considerable distances.
Pesticides with a high inhalation hazard will be labelled with directions to
use a respirator.
Ingestion (by mouth)
While ingestion (by mouth) is a
less common way to be exposed, it can result in the most severe poisonings.
There are numerous reports of people accidentally drinking a pesticide that has
been put into an unlabelled bottle or beverage cup/container (including soft
drink cans or bottles). Workers who handle pesticides may also unintentionally
ingest the substance when eating or smoking if they have not washed their hands
first.
(From: BC Environment, 1990.
"Handbook for Pesticide Applicators and Dispensers")
For more information about how
chemicals can enter your body, please see the OSH Answers document How Workplace Chemicals Enter the Body.
How
do I know if a pesticide will be harmful to me?
Because there are so many types
of pesticides, the toxicity can vary greatly. The likelihood of becoming ill
from exposure to pesticides depends on a number of factors including:
·
the type of pesticide (some
pesticides are more harmful than others),
·
the amount of pesticide you
were exposed to (how much),
·
the concentration/strength (how
strong/dose),
·
the length of exposure (how
long/time),
·
"route of entry" into
the body (skin, ingestion, or inhalation), and
·
other carriers or chemicals in
the pesticide product.
In general, the risk of illness
increases as the concentration (strength) of the pesticide, and duration
(length) of exposure increases. "How much" and "how long"
is necessary to cause illness will depend on the exact type of pesticide.
For more information about
routes of exposure, and types of toxicity, please see the OSH Answers document What Makes Chemicals Poisonous?.
Can
people become allergic to pesticides?
Fortunately, few of the thousands
of pesticides used today cause true allergies. This is because pesticides are
tested for their potential to cause allergies prior to being put on the market.
However, over time, an allergic reaction to some pesticides or chemicals used
in the formulation of some pesticides can develop in some people.
There are two types of allergic
sensitization: skin and respiratory. Symptoms of skin sensitization may include
swelling, redness, itching, pain, and blistering. Respiratory sensitization
symptoms may include wheezing, difficulty in breathing, chest tightness,
coughing and shortness of breath. In some cases, respiratory sensitization can
produce a severe asthma attack.
As the allergy develops, the
reaction can become worse with each exposure. Eventually, even a short exposure
to a low concentration of the pesticide can cause a very severe reaction.
Although it is rare, it is important to be aware that pesticides may have the
ability to cause life threatening allergic reactions in some people.
Can
pesticides cause cancer?
Health Canada states
that it will not register a pesticide that is known to cause cancer or other
illnesses when used according to label directions.
Before a pesticide is allowed
to be used or sold in Canada, it must undergo a rigorous scientific assessment
process to ensure that no harm will occur when pesticides are used according to
label directions. All pesticides registered in Canada, including for agricultural,
forestry and domestic uses, undergo this level of scrutiny.
If there is strong evidence
that exposure to a pesticide causes Parkinson's disease, cancer, other serious
illness or negative environmental effects then regulatory action will be taken.
There are many different ingredients used in pesticide formulations. As with
all chemical exposures, it is "good practice" to use products as
little as possible (or not at all) or to use a less toxic substance. If you
must use a pesticide, always follow the safe use and storage directions.
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