This poster is about atmospheric hazards at work. The top message is: GOOD AIR QUALITY = SAFE WORKPLACE.

 This poster is about atmospheric hazards at work. The top message is: GOOD AIR QUALITY = SAFE WORKPLACE.

Clean air keeps you healthy, alert and productive. Poor air can make you sick — and in confined spaces or plants, it can kill you in minutes. That's why it gives you Clean Air, Healthy Workers, Safer Operations.

It has 4 parts:

1. WHAT AFFECTS AIR QUALITY?

5 common groups of contaminants:

Gases & Vapours e.g. CO, H2S, SO2, NOx, VOCs — from engines, chemical processes, leaks. Toxic even at low ppm.

Particulate Matter e.g. dust, fume, mist, fibres — from grinding, welding, sanding, cement.

Oxygen Deficiency e.g. in confined spaces, or when nitrogen/argon is used for inerting. If O2 drops, you get dizzy and can collapse.

Combustible Gases & Vapours e.g. methane, propane, solvents — fire and explosion risk, not just toxicity.

Biological Contaminants e.g. mould, bacteria, viruses — common in damp areas, waste handling, HVAC systems.

2. HOW TO CHECK THE AIR

Use a calibrated gas detector — multi-gas where needed. The worker in the top right is holding one. Bump test and calibrate before use.

Check against exposure limits and standards — don't just look at the number on the screen, compare it to the legal limit.

Monitor regularly, especially high-risk areas like confined spaces, tanks, pits, petrochemical plants, tunnels.

Ensure adequate ventilation and fresh air supply. Ventilation is a control, not just comfort.

Keep records of all monitoring results for compliance and trend analysis.

3. SIGNS OF POOR AIR

Your body warns you:

Headache, dizziness, fatigue

Irritation of eyes, nose and throat

Breathing difficulties

Nausea or vomiting

Loss of consciousness in severe cases

Rule from the poster: IF YOU FEEL UNWELL, GET TO FRESH AIR AND SEEK MEDICAL HELP. Never try to rescue someone without breathing apparatus — you become the second victim.

4. KEY AIR QUALITY STANDARDS — The table at the bottom

This shows typical occupational exposure limits. Two key terms:

TWA: Time Weighted Average for 8 hours — the average you should not exceed during a normal shift.

STEL: Short Term Exposure Limit for 15 minutes — even if TWA is ok, you must not exceed this for short bursts.

| Contaminant | TWA | STEL | What it means |

| O2 Oxygen | 19.5 - 23.5% acceptable | Not applicable | Below 19.5% is deficient, you can asphyxiate. Above 23.5% is enriched, fire risk goes up massively 

| CO Carbon monoxide | 25 ppm | 200 ppm | Odorless, from engines/generators. Affects blood oxygen 

| H2S Hydrogen sulphide | 10 ppm | 15 ppm | Very toxic, smells like rotten eggs but you lose your sense of smell at high levels 

| NO2 Nitrogen dioxide | 3 ppm | 5 ppm | From diesel, welding, chemical plants 

| SO2 Sulphur dioxide | 2 ppm | 5 ppm | Irritant, from combustion 

| VOCs Total Volatile Organic Compounds | Varies e.g. 100 ppm | Varies e.g. 150 ppm | Solvents, paints, fuels — depends on the specific solvent 

| Respirable dust | 3 mg/m³ | Not applicable | Small particles that reach deep into lungs |

| Total dust | 10 mg/m³ | Not applicable | All inhalable dust 

Standards referenced: ACGIH TLV, OSHA PEL, NIOSH, WHO, EU and national regulations. Limits can change by country and industry — this table is typical, not legal advice.

Bottom line the poster is driving: CHECK THE AIR • MEET THE STANDARDS • STAY SAFE. Clean air is not a luxury, it's a right.

For toolbox talk, you can use it like this: 1) ask what tasks create bad air in your area today, 2) show how to use the detector, 3) remind everyone of the symptoms and the escape rule. 🌡️🚦🚧🦺⛑️🏗️⚠️💯🚥🚨💥

#ConstructionSafety #viralreels #workplacesafety #fyp #SafetyCulture #fypシ #safety #viral #safetyfirst