Chronic exposure to emissions from photocopiers in copy shops causes oxidative stress and systematic inflammation among photocopier operators in India

Table 1 Methods followed to assess indoor air quality in photocopier centers

Air quality parameters	Air flow rate	Method
Carbon monoxide	40 mL/minute for 1 hour	Indicator tube using silicomolybdate [25]
Nitrogen dioxide	200 mL/minute for 4 hours	Spectrophotometric method [26, 27]
Ozone	1 L/minute for 1 hour	Chemical method [28]
Fine particulate matter (PM_2.5)	1.5 L/minute for 8 hours	Gravimetric method [29]
Particulate matter (PM₁₀)	1000 L/minute for 8 hours	Gravimetric method [27, 30]
Sulphur dioxide	1 litre/minute for 30 minutes	West and Gaeke method [27, 31]
Lead, Arsenic, Nickel	1 litre/minute for 8 hours	Atomic Atomic Spectroscopy after absorption on filter paper [30, 32]
Ammonia	1 litre/minute for 1 hour	Indophenol method [27]
Benzene, Benzo(a)pyrene	1.2 ml/minute	Active sampling by activated charcoal tube, desorbed by Carbondisulphide followed by Gas chromatography with phenyl dimethyl polysiloxane column and flame ionisation detector [33, 34]

ISSN: 1476-069X