Sec. 231-1.10. Table 2

Latest version.

Significant impacts for nonattainment areas.

Air contaminant	Significant impact
	PPM	Weight/Volume
Sulfur dioxide
Annual	0.0004	1.0	μg/m
24-hour	0.0019	5.0	μg/m
3-hour	0.009	25.0	µg/m
Particulates
Annual	–	1.0	µg/m
24-hour	–	5.0	µg/m
Nitrogen oxides
Annual	0.0005	1.0	µg/m
Carbon monoxide
8-hour	0.45	0.5	mg/m
1-hour	1.8	2.0	mg/m

Weight/volume values are referenced to 25°C and 760 mm mercury.

Notation

Weight/volume values are referenced to 25°C and 760 mm mercury.

                    
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