Single Gas Detectors
Single gas detectors are designed to monitor and alert users to the presence of one specific gas. They are usually clipped to your pocket or somewhere around the breathing zone. At Rockall Safety, we supply a wide range of single gas detectors from leading manufacturers including Honeywell, Drager, Crowcon, and more.
As the largest distributor of Honeywell portable gas detectors in the UK, Rockall Safety is uniquely positioned to offer industry leading products at highly competitive prices, backed by expert technical support. With over 20 years of experience in gas detection, we understand which solutions work best for different industries and applications.
A single gas detector is typically worn on the body, often clipped to clothing within the breathing zone. It continuously monitors the air for a specific gas and provides audible, visual, and vibrating alarms if dangerous levels are detected. These devices are widely used in industries such as oil and gas, utilities, wastewater, construction, manufacturing, and confined space entry, where exposure to toxic or flammable gases can pose serious health and safety risks.
Single gas detectors are commonly used to monitor gases such as carbon monoxide (CO), hydrogen sulphide (H₂S), oxygen (O₂) and flammable gases such as methane (CH₄).
For more information, please call 02920 759 683 or complete the form here.
Single Gas Detectors
Single gas detectors are designed to monitor and alert users to the presence of one specific gas. They are usually clipped to your pocket or somewhere around the breathing zone. At Rockall Safety, we supply a wide range of single gas detectors from leading manufacturers including Honeywell, Drager, Crowcon, and more.
As the largest distributor of Honeywell portable gas detectors in the UK, Rockall Safety is uniquely positioned to offer industry leading products at highly competitive prices, backed by expert technical support. With over 20 years of experience in gas detection, we understand which solutions work best for different industries and applications.
A single gas detector is typically worn on the body, often clipped to clothing within the breathing zone. It continuously monitors the air for a specific gas and provides audible, visual, and vibrating alarms if dangerous levels are detected. These devices are widely used in industries such as oil and gas, utilities, wastewater, construction, manufacturing, and confined space entry, where exposure to toxic or flammable gases can pose serious health and safety risks.
Single gas detectors are commonly used to monitor gases such as carbon monoxide (CO), hydrogen sulphide (H₂S), oxygen (O₂) and flammable gases such as methane (CH₄).
For more information, please call 02920 759 683 or complete the form here.
- TOP SELLER £281.43 – £644.90
SKU: BWS1
Honeywell BW Solo Single Gas Detector
- Gas Detection Class Single Gas, Portable
- ATEX ATEX
- Gas Type Hydrogen Sulfide - H2S, Nitrogen Dioxide - NO2, Oxygen - O2, Ozone - O3, Phosphine - PH3, Sulfur Dioxide - SO2, Ammonia - NH3, Carbon Monoxide - CO, Chlorine Dioxide - ClO2, Hydrogen - H, Hydrogen Cyanide
- Response Time Varied
- Battery Run Time 12 months
- Brand BW Technologies, Honeywell
- Part Numbers BWS1-E-Y - BW™ Solo - (ETO) Wireless, BWS1-P-Y - BW™ Solo - (PH₃) Wireless, BWS1-R-Y - BW™ Solo - Hydrogen (H₂) Wireless, BWS1-S-Y - BW™ Solo - (SO₂) Wireless, BWS1-HL-Y - BW™ Solo - (H₂S) Wireless, BWS1-HC-Y - BW™ Solo - (HCL) Wireless, BWS1-H2-Y - BW™ Solo - (H₂S ext range) Wireless, BWS1-HF-Y - BW™ Solo - (HF) Wireless, BWS1-Z-Y - BW™ Solo - (HCN) Wireless, BWS1-A-Y - BW™ Solo - (NH₃) Wireless, BWS1-C-Y - BW™ Solo - (Cl₂) Wireless, BWS1-A2-Y - BW™ Solo - (NH₃ ext range) Wireless, BWS1-V-Y - BW™ Solo - (ClO₂) Wireless, BWS1-N-Y - BW™ Solo - (NO) Wireless, BWS1-ML-Y - BW™ Solo - (CO) Wireless, BWS1-D-Y - BW™ Solo - (NO₂) Wireless, BWS1-BL-Y - BW™ Solo – Carbon Dioxide (CO2) Wireless, BWS1-XL-Y - BW™ Solo - (O₂) Wireless, BWS1-M2-Y - BW™ Solo - (CO-H₂ resistant) Wireless, BWS1-G-Y - BW™ Solo - Ozone (O₃) Wireless
View product - TOP SELLER £150.26 – £260.44
SKU: BWC2-XXXXX
Honeywell BW Clip 2 Year Single Gas Detector
- Gas Detection Class Portable, Single Gas
- ATEX ATEX
- Gas Type Carbon Monoxide - CO, Hydrogen Sulfide - H2S, Oxygen - O2, Sulfur Dioxide - SO2
- Response Time Varied
- Battery Run Time 2 years
- Data Logging 35 events
- Brand BW Technologies, Honeywell
- Part Numbers BWC2-M - CO 35ppm to 200ppm, BWC2-M3060 - CO 30ppm to 60ppm, BWC2-M100 - CO 100ppm to 100ppm, BWC2-M50 - CO 50ppm to 50ppm, BWC2-H - H2S 10ppm to 15ppm, BWC2-M10200 - CO 10ppm to 200ppm, BWC2-M50100 - CO 50ppm to 100ppm, BWC2-H10 - H2S 10ppm to 10ppm, BWC2-M1050 - CO 10ppm to 50ppm, BWC2-M50200 - CO 50ppm to 200ppm, BWC2-H1632 - H2S 1.6ppm to 3.2ppm, BWC2-M2050 - CO 20ppm to 50ppm, BWC2-S - SO₂ 5ppm to 10ppm, BWC2-H1.6 - H₂S 1.6ppm to 1.6ppm, BWC2-M20100 - CO 20ppm to 100ppm, BWC2-S24 - SO₂ 2ppm to 4ppm, BWC2-H35 - H₂S 3ppm to 5ppm, BWC2-M25100 - CO 25ppm to 100ppm, BWC2-S25 - SO₂ 2ppm to 5ppm, BWC2-H5 - H₂S 5ppm to 5ppm, BWC2-M2550 - CO 25ppm to 50ppm, BWC2R-X - O2 19.5% to 23.5%, BWC2-H510 - H₂S 5ppm to 10ppm, BWC2-M2575 - CO 25ppm to 75ppm, BWC2-H710 - H₂S 7ppm to 10ppm, BWC2-M30100 - CO 30ppm to 100ppm, BWC2-H714 - H₂S 7ppm to 14ppm, BWC2-M30200 - CO 30ppm to 200ppm
View product - TOP SELLER £473.53 – £521.68
SKU: 8326342
Dräger PAC 8000 Single Gas Detector
- Gas Detection Class Single Gas, Portable
- ATEX ATEX
- Response Time Varied
- Gas Type Ammonia - NH3, Carbon Dioxide - CO2, Chlorine - Cl2, Chlorine Dioxide - ClO2, Hydrogen Cyanide, Nitrogen Dioxide - NO2, Ozone - O3, Phosphine - PH3
- Data Logging yes
- Brand Dräger
- Part Numbers 8326350 - Drager PAC 8000 NO, 8326351 - Drager PAC 8000 CO2, 8326352 - Drager PAC 8000 CI2, 8326353 - Drager PAC 8000 HCN, 8326354 - Drager PAC 8000 NH3, 8326355 - Drager PAC 8000 PH3, 8326356 - Drager PAC 8000 OV, 8326357 - Drager PAC OV-A, 8326358 - Drager PAC 8000 NO2, 8326359 - Drager PAC 8000 Ozone, 8326360 - Drager PAC 8000 Phosgene
View product - TOP SELLER £296.33 – £500.09
SKU: 6326330
Dräger PAC 6500 Single Gas Detector
- Gas Detection Class Single Gas, Portable
- ATEX ATEX
- Response Time Varied
- Gas Type Carbon Monoxide - CO, Hydrogen Sulfide - H2S, Oxygen - O2, Sulfur Dioxide - SO2
- Battery Run Time 2 years
- Data Logging yes
- Brand Dräger
- Part Numbers 8326330 - Drager PAC 6500 H2S, 8326331 - Drager PAC 6500 CO, 8326332 - Drager PAC 6500 O2, 8326333 - Drager PAC 6500 SO2
View product SKU: J-G6-H-XX-PTX-XX-4Y
Blackline G6 Single Gas Detector
- Gas Detection Class Single Gas, Portable
- ATEX ATEX
- Gas Type Carbon Monoxide - CO, Hydrogen Sulfide - H2S, Oxygen - O2, Sulfur Dioxide - SO2
- Battery Run Time Up to 1 year under normal usage
- Brand Blackline Safety
- Part Numbers J-G6-M-XX-PTX-XX-4Y / Blackline Safety G6 (CO), Protect Service Plan, 4 Year Term, J-G6-O-XX-PTX-XX-4Y / Blackline Safety G6 (O2), Protect Service Plan, 4 Year Term, J-G6-S-XX-PTX-XX-2Y / Blackline Safety G6 (SO2), Protect Service Plan, 2 Year Term, J-G6-H-XX-PTX-XX-4Y / Blackline Safety G6 (H2S), Protect Service Plan, 4 Year Term
View product- Call for Price
SKU: J-G7C-S-X-EU2-XY
Blackline G7 Multi-Gas Detector (Single Gas)
- Gas Detection Class Single Gas, Portable
- ATEX ATEX
- Gas Type Flammable - LEL, Hydrogen Cyanide, Hydrogen Fluoride - HF, Hydrogen Sulfide - H2S, Nitrogen Dioxide - NO2, Oxygen - O2, Ammonia - NH3, Ozone - O3, Carbon Dioxide - CO2, Sulfur Dioxide - SO2, Carbon Monoxide - CO, Chlorine - Cl2, Chlorine Dioxide - ClO2, VOCs
- Response Time Varied
- Battery Run Time 18 hours under normal usage
- Brand Blackline Safety
View product SKU: G8-SINGLE-GAS
Blackline G8 Multi-Gas Detector (Single Gas)
- Gas Detection Class Single Gas, Portable
- ATEX ATEX
- Gas Type Chlorine Dioxide - ClO2, Flammable - LEL, PID, VOCs, Hydrogen - H, Hydrogen Cyanide, Hydrogen Fluoride - HF, Hydrogen Sulfide - H2S, Nitrogen Dioxide - NO2, Ammonia - NH3, Oxygen - O2, Carbon Dioxide - CO2, Ozone - O3, Carbon Monoxide - CO, Sulfur Dioxide - SO2, Chlorine - Cl2
- Response Time Varied
- Battery Run Time 18 hours
- Brand Blackline Safety
- Part Numbers J-G8C-01-EU2-S-L-2Y-SXXXX-2Y / 4G/LTE Std SIM, 2 Yr Wty, CI2 Sensor, Std Serv Plan, No 3rd Party Monitoring, No Voice, No PTT, No Team Calling, 2 Yrs, J-G8C-01-EU2-S-M-2Y-SXXXX-2Y / 4G/LTE Std SIM, 2 Yr Wty, CO Sensor, Std Serv Plan, No 3rd Party Monitoring, No Voice, No PTT, No Team Calling, 2 Yrs, J-G8C-01-EU2-S-N-2Y-SXXXX-2Y / 4G/LTE Std SIM, 2 Yr Wty, HCN Sensor, Std Serv Plan, No 3rd Party Monitoring, No Voice, No PTT, No Team Calling, 2 Yrs, J-G8C-01-EU2-S-O-2Y-SXXXX-2Y / 4G/LTE Std SIM, 2 Yr Wty, O2 Sensor, Std Serv Plan, No 3rd Party Monitoring, No Voice, No PTT, No Team Calling, 2 Yrs, J-G8C-01-EU2-S-2-2Y-SXXXX-2Y / 4G/LTE, Std SIM, 2 Yr Wty, HF Sensor, Std Serv Plan, No 3rd Party Monitoring, No Voice, No PTT, No Team Calling, 2 Yrs, J-G8C-01-EU2-S-S-2Y-SXXXX-2Y / 4G/LTE Std SIM, 2 Yr Wty, SO2 Sensor, Std Serv Plan, No 3rd Party Monitoring, No Voice, No PTT, No Team Calling, 2 Yrs, J-G8C-01-EU2-S-A-2Y-SXXXX-2Y / 4G/LTE Std SIM, 2 Yr Wty, NH3 Sensor, Std Serv Plan, No 3rd Party Monitoring, No Voice, No PTT, No Team Calling, 2 Yrs, J-G8C-01-EU2-S-V-2Y-SXXXX-2Y/ 4G/LTE Std SIM, 2 Yr Wty, PID Sensor, Std Serv Plan, No 3rd Party Monitoring, No Voice, No PTT, No Team Calling, 2 Yrs, J-G8C-01-EU2-S-C-2Y-SXXXX-2Y / 4G/LTE Std SIM, 2 Yr Wty, CO2 Sensor, Std Serv Plan, No 3rd Party Monitoring, No Voice, No PTT, No Team Calling, 2 Yrs, J-G8C-01-EU2-S-W-2Y-SXXXX-2Y / 4G/LTE Std SIM, 2 Yr Wty, CIO2 Sensor, Std Serv Plan, No 3rd Party Monitoring, No Voice, No PTT, No Team Calling, 2 Yrs, J-G8C-01-EU2-S-E-2Y-SXXXX-2Y / 4G/LTE Std SIM, 2 Yr Wty, O3 Sensor, Std Serv Plan, No 3rd Party Monitoring, No Voice, No PTT, No Team Calling, 2 Yrs, J-G8C-01-EU2-S-G-2Y-SXXXX-2Y / 4G/LTE Std SIM, 2 Yr Wty, H2 Sensor, Std Serv Plan, No 3rd Party Monitoring, No Voice, No PTT, No Team Calling, 2 Yrs, J-G8C-01-EU2-S-H-2Y-SXXXX-2Y / 4G/LTE Std SIM, 2 Yr Wty, H2S Sensor, Std Serv Plan, No 3rd Party Monitoring, No Voice, No PTT, No Team Calling, 2 Yrs, J-G8C-01-EU2-S-K-2Y-SXXXX-2Y / 4G/LTE Std SIM, 2 Yr Wty, No2 Sensor, Std Serv Plan, No 3rd Party Monitoring, No Voice, No PTT, No Team Calling, 2 Yrs
View productSKU: GS-XX-A-001-G
Crowcon Gasman Single Gas Detector (Rechargeable)
- Gas Detection Class Portable, Single Gas
- ATEX ATEX
- Gas Type Chlorine Dioxide - ClO2, Flammable - LEL, Hydrogen - H, Hydrogen Cyanide, Hydrogen Fluoride - HF, Hydrogen Sulfide - H2S, Oxygen - O2, Ammonia - NH3, Ozone - O3, Carbon Dioxide - CO2, Phosphine - PH3, Carbon Monoxide - CO, Chlorine - Cl2
- Response Time Flammable: 20 seconds, Toxic gases: 20 seconds, Oxygen: 10 seconds
- Brand Crowcon
- Part Numbers GS-AG-A-001-G / 0-25% volume oxygen / Rechargeable Battery (ATEX), GS-BG-A-001-G / 0-500ppm hydrogen sulphide / Rechargeable Battery (ATEX), GS-AH-A-001-G / 0-500ppm carbon monoxide / Rechargeable Battery (ATEX), GS-AR-A-001-G / 0-100ppm ammonia / Rechargeable Battery (ATEX), GS-AJ-A-001-G / 0-20ppm sulphur dioxide / Rechargeable Battery (ATEX), GS-AA-A-001-G / 0-100% LEL Methane / Rechargeable Battery (ATEX), GS-AK-A-001-G / 0-2000ppm hydrogen / Rechargeable Battery (ATEX), GS-AB-A-001-G / 0-100% LEL propane / Rechargeable Battery (ATEX), GS-AQ-A-001-G / 0-25ppm hydrogen cyanide* / Rechargeable Battery (ATEX), GS-AC-A-001-G / 0-100% LEL pentane / Rechargeable Battery (ATEX), GS-AT-A-001-G / 0-5ppm phosphine* / Rechargeable Battery (ATEX), GS-AE-A-001-G / 0-100% LEL ethylene / Rechargeable Battery (ATEX), GS-AV-A-001-G / 0-10ppm hydrogen fluoride* / Rechargeable Battery (ATEX), GS-AF-A-001-G / 0-100% LEL hydrogen / Rechargeable Battery (ATEX), GS-AU-A-001-G / 0-1ppm fluorine* / Rechargeable Battery (ATEX), GS-AD-A-001-G / 0-100% LEL butane / Rechargeable Battery (ATEX), GS-BB-A-001-G / 0-1ppm phosgene* / Rechargeable Battery (ATEX)
View productSKU: UOBCAGB-OC
Crowcon UNOIQ Single Gas Detector
- Gas Detection Class Single Gas, Portable
- ATEX PENDING
- Gas Type Hydrogen - H, Hydrogen Sulfide - H2S, Methane - CH4, Nitrogen Dioxide - NO2, Oxygen - O2, Ozone - O3, Ammonia - NH3, Sulfur Dioxide - SO2, Butane - C4H10, Carbon Dioxide - CO2, Carbon Monoxide - CO, Flammable (MPS), Chlorine - Cl2
- Response Time <10s
- Brand Crowcon
- Part Numbers UOBCAGB-OC / UnoIQ Oxygen (0-25%) BLE ATEX/IECEx GB (Incl. USB-C Charger), UOBCAGB-FD / UnoIQ Methane (0-100% LEL) BLE ATEX/IECEx GB (Incl. USB-C Charger), UOBCAGB-AL / UnoIQ Hydrogen Sulphide (0-100ppm) BLE ATEX/IECEx GB (Incl. USB-C Charger), UFBCZGB-IA / UnoIQ Carbon Dioxide (0-2%) BLE SAFE AREA GB (Incl. USB-C Charger)
View product- Call for Price
SKU: GS-XX-B-001-G
Crowcon Gasman Single Gas Detector
- Gas Detection Class Single Gas, Portable
- ATEX ATEX
- Gas Type Carbon Dioxide - CO2, Ozone - O3, Carbon Monoxide - CO, Phosphine - PH3, Chlorine - Cl2, Sulfur Dioxide - SO2, Chlorine Dioxide - ClO2, Flammable - LEL, Hydrogen - H, Hydrogen Cyanide, Hydrogen Fluoride - HF, Hydrogen Sulfide - H2S, Nitric Oxide - NO, Ammonia - NH3, Oxygen - O2
- Response Time Varied
- Battery Run Time 2 years
- Data Logging 900 hours storage at 1 min. interval (54,000 logs)
- Brand Crowcon
View product SKU: 832632X
Dräger PAC 6000 Single Gas Detector
- Gas Detection Class Single Gas
- ATEX ATEX
- Gas Type Hydrogen Sulfide - H2S, Oxygen - O2, Sulfur Dioxide - SO2, Carbon Monoxide - CO
- Response Time Varied
- Battery Run Time 2 years
- Data Logging yes
- Brand Dräger
- Part Numbers 8326323 - Drager PAC 6000 SO2, 8326320 - Drager PAC 6000 H2S, 8326321 - Drager PAC 6000 CO, 8326322 - Drager PAC 6000 O2
View productSKU: 8326365
Dräger PAC 8500 Dual Gas Detector
- Gas Detection Class Single Gas, Portable
- ATEX ATEX
- Gas Type Carbon Monoxide - CO, Hydrogen Sulfide - H2S, Oxygen - O2
- Battery Run Time 2 years
- Data Logging yes
- Response Time Varied
- Brand Dräger
- Part Numbers 8326365 - Drager PAC 8500 H2S/CO, 8326366 - Drager PAC 8500 O2/CO, 8326367 - Drager PAC 8500 CO-H2 CP
View productSKU: BWSX-XX-B
Honeywell BW Solo Single Gas Detector (Black)
- Gas Detection Class Single Gas, Portable
- ATEX ATEX
- Gas Type Hydrogen - H, Hydrogen Cyanide, Hydrogen Sulfide - H2S, Nitrogen Dioxide - NO2, Oxygen - O2, Ozone - O3, Phosphine - PH3, Sulfur Dioxide - SO2, Ammonia - NH3, Carbon Monoxide - CO, Chlorine Dioxide - ClO2
- Response Time Varied
- Battery Run Time 12 months
- Brand BW Technologies, Honeywell
- Part Numbers BWS1-E-B - BW™ Solo - (ETO) Wireless, BWS1-P-B - BW™ Solo - (PH₃) Wireless, BWS1-R-B - BW™ Solo - Hydrogen (H₂) Wireless, BWS1-S-B - BW™ Solo - (SO₂) Wireless, BWS1-HL-B - BW™ Solo - (H₂S) Wireless, BWS1-HC-B - BW™ Solo - (HCL) Wireless, BWS1-H2-B - BW™ Solo - (H₂S ext range) Wireless, BWS1-HF-B - BW™ Solo - (HF) Wireless, BWS1-Z-B - BW™ Solo - (HCN) Wireless, BWS1-A-B - BW™ Solo - (NH₃) Wireless, BWS1-C-B - BW™ Solo - (Cl₂) Wireless, BWS1-A2-B - BW™ Solo - (NH₃ ext range) Wireless, BWS1-V-B - BW™ Solo - (ClO₂) Wireless, BWS1-N-B - BW™ Solo - (NO) Wireless, BWS1-ML-B - BW™ Solo - (CO) Wireless, BWS1-D-B - BW™ Solo - (NO₂) Wireless, BWS1-BL-B - BW™ Solo – Carbon Dioxide (CO2) Wireless, BWS1-XL-B - BW™ Solo - (O₂) Wireless, BWS1-M2-B - BW™ Solo - (CO-H₂ resistant) Wireless, BWS1-G-B - BW™ Solo - Ozone (O₃) Wireless
View productSKU: BWC3-H510
Honeywell BW Clip 3 Year Single Gas Detector
- Gas Detection Class Portable, Single Gas
- ATEX ATEX
- Gas Type Carbon Monoxide - CO, Hydrogen Sulfide - H2S
- Response Time Varied
- Battery Run Time 3 years
- Brand BW Technologies, Honeywell
- Part Numbers BWC3-H - H₂S 10ppm to 15ppm, BWC3-M2575 - CO 25ppm to 75ppm, BWC3-H1.63.2 - H₂S 1.6ppm to 3.2ppm, BWC3-M30200 - CO 30ppm to 200ppm, BWC3-H27 - H₂S 2ppm to 7ppm, BWC3-M3060 - CO 30ppm to 60ppm, BWC3-H510 - H₂S 5ppm to 10ppm, BWC3-M50100 - CO 50ppm to 100ppm, BWC3-H1010 - H₂S 10ppm to 10ppm, BWC3-M50200 - CO 50ppm to 200ppm, BWC3-M - CO 35ppm to 200ppm, BWC3-M1535 - CO 15ppm to 35ppm, BWC3-M25100 - CO 25ppm to 100ppm, BWC3-M20100 - CO 20ppm to 100ppm, BWC3-M25150 - CO 25ppm to 150ppm, BWC3-M2550 - CO 25ppm to 50ppm
View productSKU: 3361008
Dräger X-am 5100 Single Gas Detector
- Gas Detection Class Single Gas, Portable
- ATEX ATEX
- Gas Type Hydrogen Chloride - HCl, Hydrogen Fluoride - HF
- Response Time 60 seconds
- Battery Run Time 150 hours (alkaline battery)
- Data Logging 1000 hours
- Brand Dräger
- Part Numbers 3361008 - X-AM 5100 HCI/HF - c/w Battery & Charger, 3361009 - X-AM 5100 H2O2 Kit - c/w Battery & Charger
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SKU: SGC-P-H / SGC-P-C
GasClip Plus Single Gas Detector
- Gas Detection Class Single Gas, Portable
- ATEX ATEX
- Gas Type Carbon Monoxide - CO, Hydrogen Sulfide - H2S
- Battery Run Time 2 years
- Data Logging 25 events
- Brand Gas Clip Technologies
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FAQs
A single gas detector is designed to monitor one specific hazardous gas, such as carbon monoxide (CO), hydrogen sulfide (H₂S), or oxygen. It uses sensors to measure gas levels in real time and alerts the user if concentrations exceed safe limits. Other sensors available.
Single gas detectors are used to detect a singular gas like carbon monoxide, hydrogen sulfide, oxygen, nitrogen dioxide, sulfur dioxide and more.
Single gas detectors are ideal when you only need to monitor one specific hazard, such as oxygen deficiency or carbon monoxide exposure. They are lightweight and easy to use, usually just one button.
Single gas detectors should be bump tested before each shift to ensure the sensor responds correctly. Full calibration is recommended every 6 to 12 months. Please get in contact with Rockall Safety for more information.
Single gas detectors are commonly used in confined spaces like tanks and sewers to monitor oxygen levels or toxic gases.
Single gas detectors are lightweight, easy to use, cost-effective, and provide focused protection against a specific gas hazard.