Statistical Evaluation of Indoor Air Quality Parameters in Classrooms of a University

Table 1

Comparison of indoor air quality standards of different countries.

Countries	CO2	Particle matter	Relative humidity	Temperature
USA ASHRAE	1000 ppm	PM10 < 75 μg/m^3 (annual average)	%30–60	20–25.5°C
USA/EPA/NAAQS	-	50 gr/m^3 (1 year)	-	-
USA NIOSH	5000 ppm; 30000 ppm (15 min)	-	-	-
USA OSHA	10000 ppm; 30000 ppm (15 dak.)	5 mg/m^3 (8 hours) Respirable dust	-	-
USA ACGIH	5000 ppm; 9000 ppm (15 min)	3 mg/m^3 (8 hours)	-	-
Germany MAK	5000 ppm; 9000 ppm (15 min)	-	%30–70	20–26°C
Canada	3500 ppm	PM2.5 < 40 μg/m^3 (8 hours) 100 μg/m^3 (1 hour)	%30–80; (summer); %30–55; (winter)	-
China	-	PM10 < 150 μg/m^3	-	-
WHO	-	PM10 < 20 μg/m^3 (annual average); PM10 < 50 μg/m^3 (24 hours)	-	-
England	-	PM10 < 50 μg/m^3	-	-
Norway	-	PM2.5 < 20 μg/m^3	-	-
European Union	-	PM2.5 < 35 μg/m^3	-	-
Hong Kong	800 ppm (Level 1)	PM10 < 20 μg/m^3 (Level 1)	%40–70	20–25.5°C
	1000 ppm (Level 2)	PM10 < 180 μg/m^3 (Level 2)
		(8 hours average)

: American Society of Heating, Refrigerating and Air-Conditioning Engineers, /NAAQS: Environmental Protection Agency/National Ambient Air Quality Standards, : National Institute of Occupational Safety And Health, : Occupational Safety and Health Administration, : American Conference of Governmental Industrial Hygienists, and : German Maximale Arbeitsplatz Konzentrationen.