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During the research process of spices, a victim placed waste liquid containing phosphoric chloride, which was used as a reagent, into a waste tank filled with water for fire prevention. This resulted in a reaction with the water in the tank, producing chlorine gas, leading to exposure. The victim was transported to the hospital by ambulance and was diagnosed with "chlorine gas poisoning and symptoms of chemical conjunctivitis," resulting in hospitalization. [Recommendation] ■ In addition to risk reduction measures, it is recommended to work while ensuring safety with a gas detection alarm. *For more details, please refer to the PDF document or feel free to contact us.

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On the day before, gas concentration measurements were conducted in the cargo hold where fumigation had taken place, under the supervision of a quarantine officer. As a result, the effectiveness of the fumigation was confirmed, and the opening work for the hatches of each cargo hold began. Since the victim had not returned, a search was conducted, and it was discovered that there was a hatch on the deck that was left open. Looking down from there, the victim was found lying on their back with a gas mask on. Although gas measurements were taken, oxygen concentration measurements were not conducted, leading to a state of asphyxiation, resulting in death due to oxygen deficiency. [Recommendation] ■ For safety confirmation, it is recommended to use a portable gas monitor capable of detecting multiple gases with one device. *For more details, please refer to the PDF document or feel free to contact us.

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In the electrical room, the main power was turned on, the main circuit switch at the site was turned off, and when the "forward" button on the measuring device was pressed, the measuring device retreated due to the gas pressure in the furnace. After pressing the "stop button," the measuring device temporarily stopped, but then when the purge button for the antenna of the measuring device into the furnace was pressed, the measuring device retreated further. Gas from the furnace leaked through the tire seal section of the ball valve that was stopping the gas leak, and many people who were near the control panel and watching the test from a distance were exposed to the furnace gas and suffered from carbon monoxide poisoning. [Proposal] ■ Workers should wear portable gas monitors while working. ■ This allows for early detection of furnace gas leaks and can alert workers and those nearby to the danger. *For more details, please refer to the PDF document or feel free to contact us.

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During the cleaning of the lower section of the desulfurization unit, the victim and two colleagues were using a vacuum hose to perform suction work outside the inner manhole, while four others were inside the manhole. The observer at the steel mill sensed an unpleasant irritating odor and, concerned about the inflow of exhaust gas from the sintering machine, measured the levels of sulfur dioxide, oxygen concentration, and carbon monoxide concentration inside the manhole. The oxygen concentration was 18.8% and the carbon monoxide concentration was 130 ppm, prompting the observer to instruct the workers inside the manhole to "run away." After receiving medical attention, both the observer and the victim were advised to be hospitalized; however, the observer returned home the same day, while the victim was hospitalized for a week due to carbon monoxide poisoning. [Suggestions] - Workers should wear portable gas monitors while working. - This will enable early detection of gas leaks in the furnace and alert workers and those nearby to potential dangers. *For more details, please refer to the PDF document or feel free to contact us.*

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During regular maintenance, the internal painting of the draft was carried out, but due to areas left unpainted and poor painting quality, the workers entered the draft to perform finishing touches. One person who was inside the draft during the painting sat down, and another became unable to move, so they were taken to the hospital. Following examinations, both were diagnosed with poisoning from organic solvents. [Suggestions] - Use gas detectors to confirm the effectiveness of ventilation. - Work while checking safety with portable gas monitors. *For more details, please refer to the PDF document or feel free to contact us.*

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Three workers were engaged in the replacement of the backflow prevention valve on the water supply pipe installed in the pump well. While using a submersible pump driven by a gasoline engine to draw water, exhaust gases accumulated in the pump well, causing the three workers to report feeling unwell and lose consciousness. Two victims who remained in the pump well were rescued by staff from the water purification plant who arrived on the scene. One individual managed to escape on their own, and all three were transported to the hospital, where they were hospitalized for 11 days. [Recommendations] - Use gas detectors to confirm the effectiveness of ventilation. - Work while ensuring safety with a portable gas monitor. *For more details, please refer to the PDF document or feel free to contact us.*

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The victim began working around 3:30 PM on the day of the incident, entering the peeling cleaning tank to remove paint sludge. They entered the bottom of the tank to gather the sediment and discharge it outside the tank, but around 4:10 PM, after discharging the sediment three times, they were affected. At the time of discovery, the victim was found collapsed in a crouched position at the bottom of the washing tank and was unconscious. They were transported to the hospital by ambulance, received treatment, and regained consciousness approximately 2 hours and 10 minutes after the incident. [Suggestions] - Workers should wear personal PID monitors while working. - This allows for monitoring exposure conditions and can assist in chemical risk assessments. *For more details, please refer to the PDF document or feel free to contact us.*

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During the post-processing stage of producing the adsorbent, sodium hypochlorite was added to the water after removing bromine cyanide for treatment purposes, which resulted in the generation of hydrogen cyanide due to a chemical reaction. Since no exposure prevention measures were taken, the worker was exposed to hydrogen cyanide. About 30 minutes after finishing the work, the worker felt nauseous and went to the hospital, where they were diagnosed with cyanide poisoning and admitted. 【Suggestion】 ■ In addition to risk reduction measures, it is recommended to work while ensuring safety with a gas detection alarm. * For more details, please refer to the PDF document or feel free to contact us.

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While a basket was rotating in the washing tank of the cleaning device, it came loose, causing the products being cleaned to scatter inside the tank. A worker entered the cleaning device to pick up the scattered products. However, since they entered while there was still about half of the cleaning solution remaining, they inhaled the vapor of dichloromethane contained in the cleaning solution and were exposed. The worker lost consciousness after inhaling the vapor of the cleaning solution and was found in a state caught on a hanger inside the cleaning device by the cleaning operator, who rescued them. They were diagnosed with dichloromethane poisoning by a doctor and took 15 days off work. [Recommendations] ■ Measuring gas concentration is effective for confirming adequate ventilation. ■ Using a personal PID monitor for chemical risk assessment is recommended. *For more details, please refer to the PDF document or feel free to contact us.

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While the worker was discharging sludge in the circulating water receiving tank, they inhaled hydrogen sulfide generated from the sludge, suddenly lost consciousness, and collapsed. A worker who entered the tank to rescue them also lost consciousness and collapsed. Workers equipped with oxygen tanks and respirators rushed in, entered the tank, and rescued the two individuals. When measuring the hydrogen sulfide concentration at the location where measurements were taken before the work, it was found to be over 100 ppm. 【Suggestions】 - Use gas detectors to confirm the effectiveness of ventilation. - Work while ensuring safety with portable gas monitors. *For more details, please refer to the PDF document or feel free to contact us.*

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This is a case study of the drying process of a pharmaceutical intermediate containing a large amount of acetone as a solvent in a pharmaceutical manufacturing facility. During the production of pharmaceuticals, workers were transferring intermediates to a drying room after filtration, moving them onto trays, and placing the trays onto the shelves of a low-temperature dryer, which resulted in exposure to high concentrations of acetone. After completing their work in the drying room, two workers reported feeling unwell and were taken to the hospital, where they were diagnosed with organic solvent poisoning and received inpatient treatment. **Suggestions** - Workers should wear personal PID monitors while working. - This will allow for monitoring exposure levels and assist in the risk assessment of chemical substances. *For more details, please refer to the PDF document or feel free to contact us.*

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When hot water is poured into an extraction container filled with roasted coffee beans to extract coffee concentrate, carbon monoxide that had been adsorbed onto the roasted coffee beans is suddenly released and accumulates in the sealed extraction container. A stick used to level the coffee beans that had fallen into the container was attempted to be retrieved after extraction, resulting in an accident. The victim was affected while discharging the leftover coffee grounds and fell inside the container. By the time they were rescued from the extraction container, they were already unconscious, and a subsequent hospital diagnosis revealed carbon monoxide poisoning, leading to their death about a month later. [Recommendation] ■ To prevent carbon monoxide poisoning during work, such as leaks from the extraction container, the use of portable carbon monoxide monitors is recommended. *For more details, please refer to the PDF document or feel free to contact us.

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This is a case from a workspace with a gas oven in a Japanese and Western confectionery manufacturing factory. A gas oven was used without a duct for discharging combustion gases (LP gas) after combustion, and the ventilation fan was not turned on. The windows and entrances were kept closed except during entry and exit, leading to exposure to carbon monoxide generated by the gas oven during work. The worker complained of headaches and nausea, and upon rushing to the hospital, it was determined to be carbon monoxide poisoning. The worker with severe symptoms took a day off. 【Suggestion】 ■ It is recommended to measure the gas concentration in the work environment to check for the presence or accumulation of gas. *For more details, please refer to the PDF document or feel free to contact us.

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After transferring the crystals generated in the reaction vessel to a centrifuge and filtering them, we washed them with acetonitrile. However, due to insufficient washing, we switched to a kneading wash method that involved inserting hands into the centrifuge. We removed the duct of the local exhaust system of the centrifuge, which was obstructing the work, and while performing the task, we inhaled acetonitrile vapors, leading to exposure. The next day, four workers engaged in the kneading wash of the crystals reported feeling weak and went to the hospital for examination, where they were diagnosed with acetonitrile poisoning. [Proposal] - Workers should wear personal PID monitors while working. - This will allow for monitoring exposure conditions and assist in the risk assessment of chemicals. *For more details, please refer to the PDF document or feel free to contact us.*

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