Work Place Stress

We hear a lot about stress, but what is it? Taber’s Cyclopedia Medical Dictionary defines stress as “the result produced when a structure, system or organism is acted upon by forces that disrupt equilibrium or produce strain”. In simpler terms, stress is the result of any emotional, physical, social, economic, or other factors that require a response or change. It is generally believed that some stress is okay (sometimes referred to as “challenge” or “positive stress”) but when stress occurs in amounts that you cannot handle, both mental and physical changes may occur.

“Workplace stress” then is the harmful physical and emotional responses that can happen when there is a conflict between job demands on the employee and the amount of control an employee has over meeting these demands. In general, the combination of high demands in a job and a low amount of control over the situation can lead to stress.

Stress in the workplace can have many origins or come from one single event. It can impact on both employees and employers alike.

Cause stress at the workplace:

In the workplace, stress can be the result of any number of situations. Some examples include:

Stress cause health effects:

Yes, stress can have an impact on your overall health. Our bodies are designed, pre-programmed if you wish, with a set of automatic responses to deal with stress. This system is very effective for the short term “fight or flight” responses we need when faced with an immediate danger. The problem is that our bodies deal with all types of stress in the same way. Experiencing stress for long periods of time (such as lower level but constant stressors at work) will activate this system, but it doesn’t get the chance to “turn off”. The body’s “pre-programmed” response to stress has been called the “Generalized Stress Response” and includes:

  • increased blood pressure.
  • increased metabolism (e.g., faster heartbeat, faster respiration).
  • decrease in protein synthesis, intestinal movement (digestion), immune and allergic response systems.
  • increased cholesterol and fatty acids in blood for energy production systems.
  • localized inflammation (redness, swelling, heat and pain).
  • faster blood clotting.
  • increased production of blood sugar for energy.
  • increased stomach acids.

From: Basic Certification Training Program: Participant’s Manual, Copyright© 2006 by the Workplace Safety and Insurance Board of Ontario.

Stress can contribute to accidents/injuries by causing people to:

  • sleep badly.
  • over-medicate themselves and/or drink excessively.
  • feel depressed.
  • feel anxious, jittery and nervous.
  • feel angry and reckless (often due to a sense of unfairness or injustice).

When people engage in these behaviours or are in these emotional states, they are more likely to:

  • become momentarily (but dangerously) distracted
  • make errors in judgment.
  • put their bodies under physical stress, increasing the potential for strains and sprains.
  • fail in normal activities that require hand-eye or foot-eye coordination.

Stress can also lead to accidents or injuries directly by not giving the person the control necessary to stop the threat to their physical well-being.

Luckily, there are usually a number of warning signs that help indicate when you are having trouble coping with stress before any severe signs become apparent. These signs are listed below.

Interpretation of your score (based on the number of “Yes” selections):

0-5:  There are few hassles in your life.  Make sure though, that you are not trying to deliberately avoid problems.

6-10: You’ve got your life in fairly good control.  Work on the choices and habits that could still be causing you some unnecessary stress in your life.

11-15: You are approaching the danger zone.  You may be suffering stress-related symptoms and your relationships could be strained.  Think carefully about choices you’ve made and take relaxation breaks every day.

16-25: Emergency!  It is critical that you stop and re-think how you are living; change your attitudes and pay careful attention to diet, exercise and relaxation.

Signs or symptoms happen all at once and what level of help should be sought?

No, not normally. The signs and symptoms from stress tend to progress through several phases or stages. The phases can be described as below:

Improve my overall mental health:

Good mental health helps us to achieve balance and cope with stressful times.

Other mental fitness tips include:

  • Give yourself permission to take a break from your worries and concerns. Recognize that dedicating even a short time every day to your mental fitness will reap significant benefits in terms of feeling rejuvenated and more confident.
  • “Collect” positive emotional moments – Make a point of recalling times when you have experienced pleasure, comfort, tenderness, confidence or other positive things.
  • Do one thing at a time – Be “present” in the moment, whether out for a walk or spending time with friends, turn off your cell phone and your mental “to do” list.
  • Enjoy hobbies – Hobbies can bring balance to your life by allowing you to do something you enjoy because you want to do it.
  • Set personal goals – Goals don’t have to be ambitious. They could be as simple as finishing a book, walking around the block every day, learning to play bridge, or calling your friends instead of waiting by the phone. Whatever goal you set, reaching it will build confidence and a sense of satisfaction.
  • Express yourself – Whether in a journal or talking to a wall, expressing yourself after a stressful day can help you gain perspective, release tension, and boost your body’s resistance to illness.
  • Laugh – Laughter often really is the best medicine. Even better is sharing something that makes you smile or laugh with someone you know.
  • Treat yourself well – Take some “you” time – whether it’s cooking a good meal, having a bubble bath or seeing a movie, do something that brings you joy.

Silica Safety


Crystalline silica is an important industrial material found abundantly in the earth’s crust. It is a mineral that occurs in several forms. Quartz, the most common form, is a component of sand, stone, rock, concrete, brick, block, and mortar. Many of these materials are used every day across a wide variety of industrial settings, including construction, mining, manufacturing, maritime, and agriculture.

Occupational exposure to crystalline silica often occurs as part of common workplace operations involving cutting, sawing, drilling, and crushing of concrete, brick, block, rock, and stone products (such as in construction work). Operations using sand products (such as glass manufacturing, foundries, and sand blasting) can result in worker inhalation of small (respirable) crystalline silica particles from the air. These types of exposures can lead to the development of disabling and some times fatal lung diseases, including silicosis and lung cancer. Processes historically associated with high rates of silicosis include sandblasting, sand-casting foundry operations, mining, tunneling, cement cutting and demolition, masonry work, and granite cutting.

This page offers guidance that may be useful to workers and employees across a number of industries. Resources for general industry and construction are highlighted where appropriate

OSHA regulations for occupational exposure to crystalline silica are addressed in specific standards for general industry, shipyard employment, and the construction industry.

General Industry

  • Ventilation
  • Air contaminants
    • Mineral dusts

Shipyard Employment

  • Mechanical paint removers
  • Air contaminants

Construction Industry

  • Gases, vapors, fumes, dusts, and mists
    • Gases, vapors, fumes, dusts, and mists
  • Ventilation

Silica Hazardous?

Silica, often referred to as quartz, is a very common mineral.  It is found in many materials common on construction sites, including soil, sand, concrete, masonry, rock, granite, and landscaping materials.

The dust created by cutting, grinding, drilling or otherwise disturbing these materials can contain crystalline silica particles.  These dust particles are very small. You cannot see them. This respirable silica dust causes lung disease and lung cancer. It only takes a very small amount of airborne silica dust to create a health hazard.

Recognizing that very small, respirable silica particles are hazardous, the Occupational Safety and Health Administration (OSHA) regulation 29 CFR 1926.55(a) requires construction employers to keep worker exposures at or below a Permissible Exposure Level (PEL) of 0.1 mg/m3 (click here to learn more about the PEL).  The National Institute for Occupational Safety and Health (NIOSH) has a lower Recommended Exposure Level (REL) of 0.05 mg/m3.

OSHA regulates silica exposure using the permissible exposure limit (PEL), which is the maximum amount of airborne dust an employee may be exposed to during a full work shift.

The PEL is dependent on the amount of crystalline silica that is present in the dust. The equation for this calculation is given below. For the most part, OSHA is more concerned with the respirable fraction of the sample because it is more hazardous; however, both respirable and total dust equations are shown. The following parameters are necessary to calculate the PEL and the exposure level.

  • % crystalline silica in the air samples (if the laboratory reports the silica concentrations in units of mass convert the mass to percent – e.g., [sample weight (mg) ÷ dust weight (mg) ] × 100% ):
    • % quartz
    • % cristobalite
    • % tridymite
  • Total weight of the dust collected in the air samples in milligrams.
  • Total volume of air sampled for each sample in cubic meters (1000 liters = 1 cubic meter).
  • Total sampling time for each air sample in minutes.

What are the possible exposure sources?

Crystalline silica can be found in certain types of natural materials, such as:

  • Sand
  • Soil and rock
  • Gravel
  • Sandstone
  • Slate
  • Granite
  • Clay

Typical construction materials made from these natural ingredients include:

  • Ceramic and terracotta tiles
  • Concrete and concrete block
  • Manufactured stone
  • Roof tiles
  • Bricks and blocks
  • Grouts and mortar
  • Some joint compounds
  • Abrasive materials

These become some of the sources of exposure associated with a number of the construction trades.

Exposure Levels:

Airborne exposure to crystalline silica dust can depend on a number of things, such as:

1. Types of activities

  • Cutting, drilling and coring
    • Concrete
    • Roof tile
    • Tile backer board
    • Brick and block
    • Granite
  • Grinding, Sanding and Sandblasting
    • Sack and patch
    • Tuck point grinding
    • Scabbing/scarifying
    • Drywall mud sanding
    • Hand-held surface grinding
  • Pulverizing
    • Jack and chipping hammers
    • Cement truck cleaning
    • Concrete recycling
    • Road milling
    • Backhoes, excavators
    • Demolition
  • Mixing (dry)
    • Cement
    • Plaster and grout
  • Cleaning up
    • Dry sweeping (versus wet)
    • Compressed air (versus vacuum)
    • Hauling

2. Location

  • Outside or in a wide open area versus inside or an enclosed area

3. Materials being used

  • The percentage of silica present varies a lot. The higher the content, the more likely overexposure will occur

4. Types of equipment used

  • Cutting using wet methods versus dry methods
  • Types of blades or abrasives used
  • Use of local ventilation that prevents or reduces the amount of dust you breathe

5. How long the dust-generating activity goes on in a shift

  • The longer the duration of exposure, the greater the chance of overexposure

6. Weather conditions

  • Presence of moisture
  • The lighter the wind the less likely airborne dust generated will move away from the breathing zone and be quickly diluted. On the flip side, wind currents can move the hazard away from one person to another.

WISHA exposure levels

Allowable Exposure Levels:

Cal/OSHA has established regulatory permissible exposure levels for silica that varies depending on the form of silica (quartz, fused, tripoli, tridymite and cristobolite) and particle sizes present. These allowable exposure levels are reflective of an employee’s average exposure throughout an 8-hour shift. There is a difference between “total” and “respirable” silica dust, in that “respirable” silica dust is more likely to get into the deep parts of the lungs and cause more serious damage.

Cal/OSHA’s Permissible Exposure Levels over an 8-hour average basis

  • Respirable crystalline silica (quartz, fused, tripoli), 0.1 mg/m3 – 0.1 milligrams of Silica in 1 cubic meter of air.
  • Total crystalline silica (quartz), 0.3 mg/m3.
  • Respirable cristobolite and tridymite, 0.05 mg/m3.

Who’s At Risk?

Each year, hundreds of workers die from illnesses caused by breathing in silica and thousands more become ill.

Any construction worker who performs one or more of the following tasks with any of the materials listed below is at risk of being exposed to hazardous levels silica dust.  If you work close by someone generating silica dust you may be at risk.

Task Construction   Material
Abrasive blasting
Bush hammering




Earth moving

Grinding Jack











Sweeping/cleaning up

Asphalt (for paving)



Concrete Block


Fiber Cement products


Paints containing silica

Gunite/Shot crete



Refractory Mortar/Castables

Refractory Units


Roofing tiles & paves


Soil (fill dirt and top soil)

What are the Health Effects?

Inhaling crystalline silica can lead to serious, sometimes fatal illnesses including silicosis, lung cancer, tuberculosis (in those with silicosis), and chronic obstructive pulmonary disease (COPD). In addition, silica exposure has been linked to other illnesses including renal disease and other cancers.

Inhalation of respirable crystalline silica particles has long been known to cause silicosis, a disabling, non-reversible and sometimes fatal lung disease. Respirable crystalline silica also causes lung cancer. The International Agency for Research on Cancer has designated crystalline silica as carcinogenic to humans, and the U.S. National Toxicology Program has concluded that respirable crystalline silica is known to be a human carcinogen. The National Institute for Occupational Safety and Health (NIOSH) has also recommended that respirable crystalline silica be considered a potential occupational carcinogen. In addition, exposure to respirable crystalline silica has been associated with other respiratory diseases, such as chronic obstructive pulmonary disease (including bronchitis and emphysema), as well as kidney and immune system diseases.

Signs & Symptoms

Silica causes permanent lung damage that can be disabling and potentially lead to death. When workers inhale crystalline silica, the lung tissue reacts by developing fibroid nodules and scarring around the trapped silica particles. If the nodules grow too large, breathing becomes difficult.

Silica exposure can cause silicosis and people with silicosis are also at a higher risk of developing tuberculosis. There is no cure for silicosis, but it is 100% preventable. The three types of silicosis are:

  • Chronic silicosis, which usually occurs after 10 or more years of exposure to crystalline silica at relatively low concentrations;
  • Accelerated silicosis, which results from exposure to high concentrations of crystalline silica and develops 5 to 10 years after the initial exposure; and
  • Acute silicosis, which occurs where exposure concentrations are the highest and can cause symptoms to develop within a few weeks to 4 or 5 years after the initial exposure.

Silica and other dusts also cause COPD. COPD includes chronic bronchitis, emphysema, bronchitis, and chronic airway obstruction. In 1999, COPD ranked as the fourth leading cause of death with over 124,000 deaths. COPD is projected to become the third most common cause of death worldwide by 2020.

Symptoms from both silicosis and COPD may not be obvious and can initially include shortness of breath, chest pain, or a persistent cough.  Silicosis and COPD can be severe enough to cause respiratory failure, which may eventually lead to death.

Screening & Treatment:

To make sure your doctor is aware that you may have been exposed to silica on the job, and is well informed on the signs, symptoms, and diagnosis of silica related illness, we recommend bringing a Physician’s Alert to your appointment.

Your medical examinations should include:

  • Chest x-ray – classified according to the International Labour Office (ILO) International Classification of Radiography for Pneumoconioses
  • Pulmonary function test
  • Annual evaluation for tuberculosis – Purified protein derivative (PPD) skin test – for everyone with silicosis

There is no specific treatment for silicosis. Workers are advised to avoid further exposures to silica to prevent the disease from getting worse, limit exposure to irritants, and quit smoking. Antibiotics are prescribed for respiratory infections as needed. Those with a positive skin test for tuberculosis (TB) generally need treatment with anti-TB drugs. Any change in the appearance of the chest x-ray may be a sign of TB.  Patients with severe silicosis may need to have a lung transplant.

Treatment of COPD includes inhaled bronchodilators, anti-cholinergic agents or steroids, with antibiotics prescribed for respiratory infections as needed.  As with silicosis, it is important to limit exposure to irritants and quit smoking.

In 1996, the World Health Organization – International Agency on Cancer Research (IARC) first classified silica as a known human carcinogen and in 2009, IARC reaffirmed its position noting “[an] increased risk of lung cancer [from silica exposure] was observed across various industries and processes.”

The National Cancer Institute completed a study in 2011 showing that lung cancer screening saves lives.  Based on that study the American Lung Association recommends lung cancer screening with low-dose CT scans for current or former smokers who are between 55 to 74 years, with a smoking history of at least 30 pack-years (that is, an average of a pack a day for 30 years) and with no history of lung cancer.

Controlling Exposures in Construction While:









Control plan:

Controlling the exposure to silica in construction can be done through engineering controls, administrative actions,& personal protective equipment (PPE),similar to practices in other industries. Engineering controls include such things as replacing silica with another material (substitution), isolating an exposure source, and using ventilation systems. Administrative actions include limiting workers’ exposure time and providing showers. Use of PPE includes wearing proper respiratory protection and protective clothing. The following references aid in controlling crystalline silica hazards in the workplace.

You must implement the best possible permanent solution to reducing or eliminating the hazard. If such a solution cannot be enacted immediately, then you are required to implement a temporary control to protect your workers until the permanent solution is put in place.

The following solutions are listed in order of preference. (Depending on the work site a higher choice may actually be less effective.):Abatement

Most preferred, least preferred

Use a silica substitute

Use engineering controls

Improve work practices

Use personal protective equipment

Silica Substitutes:

The most sure way to eliminate the silica hazard is to eliminate the silica!

This is especially important for sandblasters, where the abrasive blasting is often done outside and in different locations, making it impossible to install an engineering control. The most severe silica exposures occur in abrasive blasting.

Eliminating the silica means using a different, safer material in place of the silica-containing substance.  It is true that in some cases it is not possible to use a substitute in place of silica, but for many operations, such as abrasive blasting, there are many possible substitutes, including those below.

Alumaglass                                            Garnet                                    Starblast XL
Aluminum Oxide                                  Glass Beads                           Steel Grit
Aluminum Shot                                    Melamine Plastic                  Steel Shot
Ambient Polycarbonate                      Novaculite                              Urea Plastic
Armex                                                     PC+                                          Visigrit
Apricot Pits                                           Polycarbonate                         Walnut Shells
Corn Cobs                                             Silicon Carbide                        Wheat Grain
Cryogenic Polycarbonate                   Stainless Cast Shot                 White Aluminum Oxide
Emery                                                    Stainless Cut Wire                   Zircon


  • Complete elimination of any health hazard related to silica
  • Eliminates the need to implement or maintain engineering controls
  • These substances are not as dense as silica products which makes them easier to transport
  • They can be moved from job site to job site


  • May be slightly more expensive than silica products
  • These substances are generally not as hard as silica products which may mean more is needed to do the job

Engineering Controls:

Keep silica out of the air

  • Install a water hose to wet down the dust at the point of generation
  • Install local exhaust ventilation
  • During rock drilling, flow water through the drill stem
  • Install dust collection systems onto machines or equipment that generates dust
  • Use concrete/masonry saws that provide water to the blade


  • If working properly will eliminate the potential hazard
  • Must be installed only once
  • Requires little training of workers
  • Places no physical burden on workers


  • Can be expensive to implement
  • Requires routine maintenance

Work Practices

What employees can do to reduce silica intake

  • Know which work operations can lead to silica exposure
  • Participate in any air monitoring or training programs offered by the employer
  • If possible, change into disposable or washable work clothes at the worksite; shower (where available) and change into clean clothing before leaving the worksite.
  • Do not eat, drink, use tobacco, products, or apply cosmetics in areas where there is dust containing crystalline silica.
  • Wash your hands and face before eating, drinking, smoking, or applying cosmetics outside of the exposure area.
  • If using respirators, do not alter the respirator in any way.
  • Use type CE positive pressure abrasive blasting respirators for sandblasting
  • For other operations where respirators may be required, use a respirator approved for protection against crystalline silica-containing dust.
  • If using tight-fitting respirators do not grow beards or mustaches


  • They can reduce the chance for exposure.
  • They may be cheaper in the short run.


  • They require training of all new employees.
  • They require employees to use the practices appropriately.
  • They require monitoring of employees at workers.

Personal Protective Equipment

Personal protective equipment against silica includes respirators and masks.  Respirators should be used only when the dust controls cannot keep dust levels below the NIOSH Recommended Exposure Level.

There are many types of respirators,  from air-purifying to air-supplying and from a nose and mouth covering to a full body respirator.  You can receive guidance on selecting a respirator from:


  • They can reduce the chance for exposure.
  • They may be cheaper in the short run.
  • Useful as a temporary control while the long term solution is being implemented.


  • They require training of all new employees.
  • They require employees to use the equipment appropriately.
  • They require setting up a formal PPE program to validate their proper use.
  • They require monitoring of all the PPE to insure proper maintenance.
  • They can be a health hazard by themselves.

Silica Exposure

Deadly Dust – Silica

Click the below link to download more documents about silica safety