Cal. Code Regs. Tit. 17, § 70200 Table of Standards ***

• Library: California Code of Regulations
• Edition: 2023
• Currency: Current through Register 2023 Notice Reg. No. 52, December 29, 2023
• Citation: Cal. Code Regs. Tit. 17, § 70200
• Year: 2023

Substance	Concentration and Methods*	Duration of Averaging Periods	Most Relevant Effects	Comments
Ozone	0.09 ppm**	1 hour	a Short-term exposures:	a. The standard is intended to prevent
	0.070 ppm**	8 hour	(1) One-hour and multi-hour exposures: lung function decrements, and symptoms of respiratory irritation such as cough, wheeze,	adverse human health effects.
	ultraviolet		and pain upon deep inhalation.	b. The standard, when achieved,
	photometry using California Approved		(2) Multi-hour exposures: airway hyperreactivity and airway inflammation.	will not prevent all injury to crops and other types of vegetation,
	Sampler as set forth in section 17undefined70100.1(c)		(3) Excess deaths, hospitalization, emergency room visits asthma exacerbation, respiratory symptoms and restrictions in activity	but is intended to place an acceptable upper limit on the amount of yield and economic loss, as well as on adverse environmental impacts.
			b. Long-term exposures: Ozone can induce tissue changes in the respiratory tract, and is associated with decreased lung function and emergency room visits for asthma.
			c. Welfare effects:
			(1) Yield loss in important crops and predicted economic loss to growers and consumers.
			(2) Injury and damage to forests
Carbon Monoxide	9.0 ppm NDIR**	8 hours	a. Aggravation of angina pectoris and other aspects of coronary heart disease.	The relevant effects were found to be due to decreased capacity of the blood to carry oxygen, as measured by carboxyhemoglobin content.
	20 ppm NDIR**	1 hour	b Decreased exercise tolerance in persons with peripheral vascular disease and lung disease.
			c. Impairment of central nervous system functions.
			d. Possible increased risk to fetuses.
Carbon Monoxide (Applicable only in the Lake Tahoe Air Basin)	6 ppm NDIR	8 hours	Will increase COHb by 1-1 1/2%	At altitude the lowered oxygen tension leads to greater absorption of CO. Persons participating in strenuous recreational activities at higher altitudes are often unacclimated.
Sulfur Dioxide (SO2)	0.25 ppm** fluorescence method	1 hour	a. Bronchoconstriction accompanied by symptoms, which may include wheezing, shortness of breath and chest

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