Custom Gas Mixtures | Gas

We use cookies to improve your browsing experience and help us improve our websites. By continuing to use our website, you agree to our use of such cookies. Agree Learn more

Need an Account? Register or Login

Find A Branch
Customer Service
SDS Search

Switch Account
Dashboard

(0)

Need an Account? Register or Login

Find A Branch
Customer Service
SDS Search

Products

Home/
Category Page/
Gases/
Mixed Gases

Results For:
By Category
Mixed Gases
Gas Comp Amount1
79.6000000 2.5000000 99.8200000 99.9780000 99.9685000 88.0000000 9.0000000
Gas Comp 1
NITROGEN PPM NITRIC OXIDE HYDROGEN PPM ETHYLENE

Narrow Results:

{$title}

{$label}

Cylinder Size
Choose a refinement:

150 Aluminum HP (17)

200 Steel HP (3)

300 Aluminum HP (1)

300 Steel HP (1)

98L AL Refillable HP (1)

CGA Connection
Choose a refinement:

CGA 660 Washer (7)

CGA 660 (6)

CGA 350 (5)

CGA 590 (3)

CGA 180 Washer (1)

CGA 500 (1)

Gas Component Amount 1
Choose a refinement:

80.0000000 (19)

90.0000000 (19)

99.9990000 (19)

5.0000000 (17)

60.0000000 (15)

99.9975000 (15)

95.0000000 (14)

2.0000000 (11)

75.0000000 (10)

79.4875000 (10)

83.5420000 (10)

85.0000000 (10)

85.4925000 (10)

180.0000000 (9)

98.0000000 (9)

40.0000000 (8)

50.0000000 (8)

70.0000000 (8)

15.0000000 (7)

89.0000000 (7)

99.6000000 (7)

25.0000000 (6)

80.4875000 (6)

92.0000000 (6)

96.0000000 (6)

99.9791600 (6)

99.9900000 (6)

99.9950000 (6)

99.9960000 (6)

35.0000000 (5)

55.0000000 (5)

79.0000000 (5)

79.4900000 (5)

81.6400000 (5)

82.0000000 (5)

99.0000000 (5)

99.9700000 (5)

99.9750000 (5)

99.9995000 (5)

99.9998000 (5)

99.9999500 (5)

79.1000000 (4)

97.0000000 (4)

99.9600000 (4)

99.9739500 (4)

99.9800000 (4)

99.9820000 (4)

99.9830000 (4)

99.9955000 (4)

99.9991000 (4)

1.0000000 (3)

18.0000000 (3)

270.0000000 (3)

45.0000000 (3)

450.0000000 (3)

5.5000000 (3)

65.0000000 (3)

7.0000000 (3)

79.4940000 (3)

81.0420000 (3)

81.6375000 (3)

83.5400000 (3)

99.9100000 (3)

99.9947900 (3)

99.9989000 (3)

99.9997000 (3)

99.9999000 (3)

10.0000000 (2)

11.0000000 (2)

110.0000000 (2)

13.5000000 (2)

17.0000000 (2)

170.0000000 (2)

20.0000000 (2)

28.0000000 (2)

3.0000000 (2)

3.5000000 (2)

30.0000000 (2)

6.0000000 (2)

66.0000000 (2)

74.0000000 (2)

77.3200000 (2)

78.0000000 (2)

78.4000000 (2)

8.5000000 (2)

81.0000000 (2)

81.9820000 (2)

82.4100000 (2)

83.0000000 (2)

86.0000000 (2)

86.5000000 (2)

87.0000000 (2)

91.0000000 (2)

94.0000000 (2)

99.7200000 (2)

99.7500000 (2)

99.8110000 (2)

99.9000000 (2)

99.9200000 (2)

99.9400000 (2)

99.9460000 (2)

99.9500000 (2)

99.9550000 (2)

99.9730000 (2)

99.9775000 (2)

99.9835000 (2)

99.9899000 (2)

99.9910000 (2)

99.9925000 (2)

99.9937000 (2)

99.9973000 (2)

99.9980000 (2)

99.9982000 (2)

99.9983000 (2)

99.9992000 (2)

99.9992500 (2)

99.9996000 (2)

0.1000000 (1)

0.6000000 (1)

10.5000000 (1)

12.0000000 (1)

130.0000000 (1)

135.0000000 (1)

15.6000000 (1)

150.0000000 (1)

181.0000000 (1)

21.0000000 (1)

22.0000000 (1)

22.5000000 (1)

220.0000000 (1)

250.0000000 (1)

27.0000000 (1)

27.5000000 (1)

275.0000000 (1)

3000.0000000 (1)

31.4000000 (1)

31.4100000 (1)

360.0000000 (1)

37.5000000 (1)

39.0000000 (1)

4.0000000 (1)

400.0000000 (1)

42.5000000 (1)

500.0000000 (1)

53.0575000 (1)

53.7860000 (1)

540.0000000 (1)

59.0000000 (1)

61.7500000 (1)

62.0000000 (1)

64.0000000 (1)

64.6000000 (1)

64.9750000 (1)

69.0000000 (1)

69.6000000 (1)

720.0000000 (1)

74.7000000 (1)

74.9500000 (1)

76.5000000 (1)

76.9890000 (1)

77.0000000 (1)

77.3210000 (1)

77.4550000 (1)

77.5000000 (1)

77.6000000 (1)

77.8950000 (1)

77.9820000 (1)

78.4490000 (1)

78.5000000 (1)

78.5375000 (1)

78.6500000 (1)

78.7500000 (1)

78.9000000 (1)

78.9400000 (1)

78.9920000 (1)

79.1400000 (1)

79.2000000 (1)

79.4780000 (1)

79.4960000 (1)

79.5000000 (1)

79.6800000 (1)

79.7450000 (1)

79.7600000 (1)

79.9000000 (1)

79.9193000 (1)

79.9875000 (1)

79.9920000 (1)

8.0000000 (1)

80.2000000 (1)

80.4375000 (1)

80.4750000 (1)

80.4890000 (1)

80.5000000 (1)

80.6375000 (1)

80.7375000 (1)

81.1000000 (1)

81.2000000 (1)

81.6580000 (1)

81.8470000 (1)

81.8785000 (1)

81.9100000 (1)

81.9470000 (1)

81.9770000 (1)

81.9910000 (1)

81.9973000 (1)

82.4920000 (1)

82.4930000 (1)

82.4940000 (1)

82.5800000 (1)

82.8690000 (1)

82.9991500 (1)

83.0930000 (1)

83.5410000 (1)

83.6690000 (1)

83.7325000 (1)

83.8950000 (1)

84.0325000 (1)

84.7875000 (1)

84.9000000 (1)

85.4900000 (1)

85.5000000 (1)

850.0000000 (1)

86.1130000 (1)

86.2500000 (1)

86.4300000 (1)

86.8000000 (1)

87.0900000 (1)

87.0925000 (1)

87.3865000 (1)

87.4760000 (1)

87.9890000 (1)

88.5000000 (1)

88.5325000 (1)

88.7500000 (1)

88.8240000 (1)

88.9670000 (1)

88.9711000 (1)

88.9900000 (1)

88.9972500 (1)

89.1445000 (1)

89.1850000 (1)

89.4900000 (1)

90.3990000 (1)

90.4000000 (1)

90.8110000 (1)

90.9895000 (1)

91.5000000 (1)

92.7820000 (1)

92.9975000 (1)

93.2000000 (1)

93.8140000 (1)

93.8450000 (1)

94.4917500 (1)

94.5000000 (1)

95.4725000 (1)

95.4964000 (1)

95.5000000 (1)

95.9700000 (1)

95.9910000 (1)

95.9982000 (1)

97.8000000 (1)

97.8400000 (1)

97.9600000 (1)

98.2000000 (1)

98.8900000 (1)

98.9320000 (1)

98.9900000 (1)

99.4000000 (1)

99.5000000 (1)

99.5500000 (1)

99.6400000 (1)

99.6670000 (1)

99.6710000 (1)

99.6894000 (1)

99.7030000 (1)

99.7100000 (1)

99.7300000 (1)

99.7420000 (1)

99.7885000 (1)

99.7900000 (1)

99.7952000 (1)

99.8120000 (1)

99.8375000 (1)

99.8640000 (1)

99.8647000 (1)

99.8650000 (1)

99.8773500 (1)

99.8860000 (1)

99.8920000 (1)

99.8960000 (1)

99.9010000 (1)

99.9020000 (1)

99.9065000 (1)

99.9070000 (1)

99.9091000 (1)

99.9150000 (1)

99.9175000 (1)

99.9250000 (1)

99.9285000 (1)

99.9320000 (1)

99.9370000 (1)

99.9395000 (1)

99.9499500 (1)

99.9514000 (1)

99.9595000 (1)

99.9615000 (1)

99.9620000 (1)

99.9640000 (1)

99.9650000 (1)

99.9659000 (1)

99.9670000 (1)

99.9690000 (1)

99.9715000 (1)

99.9725000 (1)

99.9749500 (1)

99.9760000 (1)

99.9787500 (1)

99.9799000 (1)

99.9810000 (1)

99.9815000 (1)

99.9825000 (1)

99.9832000 (1)

99.9848000 (1)

99.9856000 (1)

99.9860000 (1)

99.9862500 (1)

99.9865000 (1)

99.9869700 (1)

99.9870000 (1)

99.9875000 (1)

99.9880000 (1)

99.9890000 (1)

99.9892000 (1)

99.9895800 (1)

99.9899880 (1)

99.9899940 (1)

99.9909000 (1)

99.9915000 (1)

99.9917500 (1)

99.9920000 (1)

99.9922000 (1)

99.9932000 (1)

99.9939000 (1)

99.9940000 (1)

99.9945000 (1)

99.9946000 (1)

99.9948400 (1)

99.9964000 (1)

99.9965000 (1)

99.9965900 (1)

99.9967000 (1)

99.9969000 (1)

99.9970000 (1)

99.9972000 (1)

99.9972500 (1)

99.9974000 (1)

99.9984000 (1)

99.9985000 (1)

99.9986500 (1)

99.9987500 (1)

99.9991805 (1)

99.9993000 (1)

99.9994000 (1)

99.9994300 (1)

99.9997500 (1)

99.9998800 (1)

99.9999250 (1)

99.9999990 (1)

Gas Component 1
Choose a refinement:

% METHANE (9)

% CARBON DIOXIDE (3)

% OXYGEN (3)

% ARGON (1)

PPM CARBON MONOXIDE (1)

Gas Component Amount 2
Choose a refinement:

12.0000000 (3)

0.4000000 (2)

15.0000000 (2)

5.0000000 (2)

97.5000000 (2)

1800.0000000 (1)

22.5000000 (1)

27.0000000 (1)

27.5000000 (1)

7.0000000 (1)

7.5000000 (1)

70.0000000 (1)

8.0000000 (1)

99.9946000 (1)

99.9991000 (1)

99.9995000 (1)

99.9997500 (1)

Gas Component 2
Choose a refinement:

PPM CARBON MONOXIDE (9)

% NITROGEN (4)

% OXYGEN (3)

% ARGON (2)

% CARBON MONOXIDE (2)

% CARBON DIOXIDE (1)

PPM CARBONYL SULFIDE (1)

PPM NITRIC OXIDE (1)

Gas Component Amount 3
Choose a refinement:

20.0000000 (2)

99.9976000 (2)

10.0000000 (1)

150.0000000 (1)

2.5000000 (1)

45.0000000 (1)

5.0000000 (1)

99.9963500 (1)

99.9964000 (1)

99.9968500 (1)

99.9983000 (1)

99.9983500 (1)

99.9992500 (1)

Gas Component 3
Choose a refinement:

% NITROGEN (8)

PPM CARBON MONOXIDE (3)

% CARBON DIOXIDE (2)

% OXYGEN (1)

PPM BENZENE (1)

Gas Component Amount 4
Choose a refinement:

300.0000000 (1)

Gas Component 4
Choose a refinement:

PPM PROPANE (1)

Compare Products Up to 4

Clear All

Mixed Gases

Sort by:

E03NI99E15A1471

2.5PPM Nitric Oxide, 2.5PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

Show Full Description Hide Full Description

Compare

2.5PPM Nitric Oxide, 2.5PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

SDS

2.5PPM Nitric Oxide, 2.5PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

Show Full Description Hide Full Description

Airgas Part #:E03NI99E15A1471

SDS

E02NI88E15A3424

12% Oxygen, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 590

Show Full Description Hide Full Description

Compare

12% Oxygen, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 590

SDS

12% Oxygen, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 590

Show Full Description Hide Full Description

Airgas Part #:E02NI88E15A3424

SDS

E03NI99E15A37W6

8PPM Carbon Monoxide, 9PPM Nitric Oxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

Show Full Description Hide Full Description

Compare

8PPM Carbon Monoxide, 9PPM Nitric Oxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

SDS

8PPM Carbon Monoxide, 9PPM Nitric Oxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

Show Full Description Hide Full Description

Airgas Part #:E03NI99E15A37W6

SDS

E03NI99E15A00E7

70PPM Nitirc Oxide, 150PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

Show Full Description Hide Full Description

Compare

70PPM Nitirc Oxide, 150PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

SDS

70PPM Nitirc Oxide, 150PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

Show Full Description Hide Full Description

Airgas Part #:E03NI99E15A00E7

SDS

E02NI99E15A0299

1800PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 350

Show Full Description Hide Full Description

Compare

1800PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 350

SDS

1800PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 350

Show Full Description Hide Full Description

Airgas Part #:E02NI99E15A0299

SDS

E02NI99E15A0663

2.5PPM Nitirc Oxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

Show Full Description Hide Full Description

Compare

2.5PPM Nitirc Oxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

SDS

2.5PPM Nitirc Oxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

Show Full Description Hide Full Description

Airgas Part #:E02NI99E15A0663

SDS

E03NI99E15A39V3

7.5PPM Carbon Monoxide, 9PPM Nitirc Oxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

Show Full Description Hide Full Description

Compare

7.5PPM Carbon Monoxide, 9PPM Nitirc Oxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

SDS

7.5PPM Carbon Monoxide, 9PPM Nitirc Oxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

Show Full Description Hide Full Description

Airgas Part #:E03NI99E15A39V3

SDS

E03NI99E15A4151

9PPM Nitric Oxide, 45PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

Show Full Description Hide Full Description

Compare

9PPM Nitric Oxide, 45PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

SDS

9PPM Nitric Oxide, 45PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

Show Full Description Hide Full Description

Airgas Part #:E03NI99E15A4151

SDS

E03NI99E15A2017

2.5PPM Nitric Oxide, 5PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

Show Full Description Hide Full Description

Compare

2.5PPM Nitric Oxide, 5PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

SDS

2.5PPM Nitric Oxide, 5PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

Show Full Description Hide Full Description

Airgas Part #:E03NI99E15A2017

SDS

E03NI99E15A1805

9PPM Nitric Oxide, 27PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

Show Full Description Hide Full Description

Compare

9PPM Nitric Oxide, 27PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

SDS

9PPM Nitric Oxide, 27PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

Show Full Description Hide Full Description

Airgas Part #:E03NI99E15A1805

SDS

E03NI99E15A03J4

9PPM Nitric Oxide, 15PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

Show Full Description Hide Full Description

Compare

9PPM Nitric Oxide, 15PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

SDS

9PPM Nitric Oxide, 15PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum, CGA 660 Washer

Show Full Description Hide Full Description

Airgas Part #:E03NI99E15A03J4

SDS

Z03NI8822000117

5% Oxygen, 7% Carbon Dioxide, Balance Nitrogen Biologic Atmosphere Batch Analyzed Mixture Size 200 High Pressure Steel Cylinder, CGA 500

Show Full Description Hide Full Description

Compare

SDS

5% Oxygen, 7% Carbon Dioxide, Balance Nitrogen Biologic Atmosphere Batch Analyzed Mixture Size 200 High Pressure Steel Cylinder, CGA 500

Show Full Description Hide Full Description

Airgas Part #:Z03NI8822000117

SDS

NI FGCD20C.43HA

0.4% Carbon Monoxide, 20% Carbon Dioxide, Balance Nitrogen Food Grade, Size 300 High Pressure Aluminum Cylinder CGA 350

Show Full Description Hide Full Description

Compare

SDS

0.4% Carbon Monoxide, 20% Carbon Dioxide, Balance Nitrogen Food Grade, Size 300 High Pressure Aluminum Cylinder CGA 350

Show Full Description Hide Full Description

Airgas Part #:NI FGCD20C.43HA

SDS

X02NI99T15A26M0

9PPM Nitirc Oxide, Balance Nitrogen Traceability Standard Size 150 High Pressure Aluminum Cylinder, CGA 660

Show Full Description Hide Full Description

Compare

9PPM Nitirc Oxide, Balance Nitrogen Traceability Standard Size 150 High Pressure Aluminum Cylinder, CGA 660

SDS

9PPM Nitirc Oxide, Balance Nitrogen Traceability Standard Size 150 High Pressure Aluminum Cylinder, CGA 660

Show Full Description Hide Full Description

Airgas Part #:X02NI99T15A26M0

SDS

X02AR97C20043R8

2.5% Hydrogen, Balance Argon Certified Reference Material, Size 200 High Pressure Steel Cylinder, CGA 350

Show Full Description Hide Full Description

Compare

SDS

2.5% Hydrogen, Balance Argon Certified Reference Material, Size 200 High Pressure Steel Cylinder, CGA 350

Show Full Description Hide Full Description

Airgas Part #:X02AR97C20043R8

SDS

X02AR97B300K502

2.5% Hydrogen, Balance Argon Batch Analyzed Mixture, Size 300 High Pressure Steel Cylinder, CGA 350

Show Full Description Hide Full Description

Compare

2.5% Hydrogen, Balance Argon Batch Analyzed Mixture, Size 300 High Pressure Steel Cylinder, CGA 350

SDS

2.5% Hydrogen, Balance Argon Batch Analyzed Mixture, Size 300 High Pressure Steel Cylinder, CGA 350

Show Full Description Hide Full Description

Airgas Part #:X02AR97B300K502

SDS

X02NI88C2004389

12% Oxygen, Balance Nitrogen Certified Reference Material, Size 200 High Pressure Steel Cylinder, CGA 590

Show Full Description Hide Full Description

Compare

SDS

12% Oxygen, Balance Nitrogen Certified Reference Material, Size 200 High Pressure Steel Cylinder, CGA 590

Show Full Description Hide Full Description

Airgas Part #:X02NI88C2004389

SDS

E03NI99E15A2184

9PPM Nitirc Oxide, 15PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

Show Full Description Hide Full Description

Compare

9PPM Nitirc Oxide, 15PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

SDS

9PPM Nitirc Oxide, 15PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

Show Full Description Hide Full Description

Airgas Part #:E03NI99E15A2184

SDS

E03NI99E15A03H3

9PPM Nitirc Oxide, 27.5PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

Show Full Description Hide Full Description

Compare

9PPM Nitirc Oxide, 27.5PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

SDS

9PPM Nitirc Oxide, 27.5PPM Carbon Monoxide, Balance Nitrogen EPA Protocol Standard Mixture, Size 150 High Pressure Aluminum Cylinder, CGA 660

Show Full Description Hide Full Description

Airgas Part #:E03NI99E15A03H3

SDS

X02NI88C15A2712

12% Oxygen, Balance Nitrogen Certified Reference Material, Size 150 High Pressure Aluminum, CGA 590

Show Full Description Hide Full Description

Compare

12% Oxygen, Balance Nitrogen Certified Reference Material, Size 150 High Pressure Aluminum, CGA 590

SDS

12% Oxygen, Balance Nitrogen Certified Reference Material, Size 150 High Pressure Aluminum, CGA 590

Show Full Description Hide Full Description

Airgas Part #:X02NI88C15A2712

SDS

1
2
NEXT ›

Customer Service
Airgas response to COVID-19▶