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Fig. 2 | Environmental Sciences Europe

Fig. 2

From: Role of nitrous acid in the association between nitrogen dioxide and asthma symptoms: effect of nitrous acid exposure on specific airway resistance in guinea pigs

Fig. 2

Examples of respiratory waveform for each of the three grades A, B and C. Horizontal lines are zero flow level. Expiratory waves are displayed above the zero flow level, and inspiratory waves are displayed below the zero flow level. The blue lines indicate thoracic flow, and red lines indicate nasal flow. The upper two waveforms were obtained in Experiment 1, and the lower two waveforms were obtained in Experiment 2

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