Prioritising Actions for Improving Classroom Air Quality Based on the Analytic Hierarchy Process: Case Studies in China and the UK

Table 1

Measures improving CAQ.

Ord	Indicator	Reference
Category I: policy
1	Dedication of a budget from the government to improve IAQ in primary schools	[76, 93]
2	Introducing a school policy for CAQ	[87, 94, 100]
3	Introducing a procedure for monitoring and auditing the CAQ	[94]
4	Restricting the most polluting vehicles around schools and pedestrianisation by school entrances	[76, 87]
5	Creating clean air zones through school streets, anti-idling campaigns, and more appropriate locations of drop-off and pick-up points	[88–91]
6	Local road layouts changes and careful selection of new school sites	[76, 90]
7	Designate an IAQ coordinator to check on clean air measures	[93, 94]
Category II: device and operating strategy
8	Using natural ventilation to improve IAQ (e.g., opening window)	[55, 56]
9	Using natural ventilation together with indoor air purifiers to improve IAQ	[27, 60, 61, 101]
10	Using mechanical ventilation to improve the IAQ in classrooms	[64, 65, 86]
11	Regular housekeeping in classrooms and regular cleaning of the air supply equipment to enhance IAQ	[87, 100, 102]
12	Improve ventilation behaviour patterns and cleaning practices	[57, 103, 104]
13	Place fans in windows to exhaust room air to the outdoors	[66]
Category III: infrastructural change
14	Providing green infrastructure to reduce outdoor pollution and enhance IAQ (e.g., green hedges and plants)	[70, 71, 76, 91, 105]
15	Introducing new HVAC systems	[77]
16	Replacement of building materials, furniture, and windows	[77–79]
17	Renovation of building envelopes	[83]
Category IV: information sharing
18	Sharing on-screen display of the status of IAQ for teachers/pupils and parents	[30, 31]
19	Reporting the IAQ regularly in the school meetings and communicating the action plans to enhance IAQ in classrooms	[84]
20	Awareness raising of the importance and influence of the IAQ in schools and children	[98, 99]