Cal. Code Regs. tit. 17 § 70200

Current through Register 2024 Notice Reg. No. 50, December 13, 2024

Section 70200 - Table of Standards ***

*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 70100.1(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 tightness, during exercise or physical activity in persons with asthma.	The standard is designed to protect against adverse effects from short-term (5-10 min.) peak exposures.
	0.04 ppm** fluorescence method.	24 hours	a. Increased incidence of pulmonary disease and symptoms, decreased pulmonary function, and increased risk of mortality.	a. Further studies on co-carcinogenic role are necessary.
				b. Does not include effects on vegetation, ecosystems and materials.
				c. Effects may not be due to SO₂ alone, but also suspended particulate matter, including sulfates and acids.
Visibility Reducing Particles	In sufficient**** amount to produce extinction of 0.23 per kilometer due to particles when relative humidity is less than 70 percent. Measurement in accordance with ARB Method V.	8 hour (10 AM-6PM Pacific Standard Time)	Visibility impairment on days when relative humidity is less than 70 percent.	This standard is intended to limit the frequency and severity of visibility impairment due to regional haze and is equivalent to a 10-mile visual range when relative humidity is less than 70 percent.
Visibility Reducing Particles (Applicable only in Lake Tahoe Air Basin)	In sufficient**** amount to produce extinction of 0.07 per kilometer due to particles when relative humidity is less than 70 percent. Measurement in accordance with ARB Method V.	8 hour (10 AM-6PM Pacific Standard Time)	Reduction in scenic quality on days when the relative humidity is less than 70 percent.	This standard is equivalent to a 30-mile visual range when relative humidity is less than 70 percent.
Suspended Particulate Matter (PM10)	50 [MICRO]g/m³ PM10**	24 hour sample	Prevention of excess deaths, illness and restrictions in activity from short- and long-term exposures. Illness outcomes include, but are not limited to, respiratory	This standard applies to suspended matter as measured by PM10 sampler, which collects 50% of all particles of 10 [MICRO]m aerodynamic diameter and collects a declining
	20 [MICRO]g/m³ PM10** using California Approved Sampler as set forth in section 70100.1(a)	24 hour samples, annual arithmetic mean	symptoms, bronchitis, asthma exacerbation, emergency room visits and hospital admissions for cardiac and respiratory diseases. Sensitive subpopulations include children, the elderly, and individuals with pre-existing cardiopulmonary disease.	fraction of particles as their diameter increases, and an increasing fraction of particles as their diameter decreases, reflecting the characteristics of lung deposition.
Fine Suspended Particulate Matter (PM2.5)	12 [MICRO]g/m³ PM2.5** California Approved Sampler as listed in section 70100.1(b)	24 hour samples, annual arithmetic mean	Prevention of excess deaths and illness from long-term exposure. Illness outcomes include, but are not limited to, respiratory symptoms, asthma exacerbation, and hospital admissions for cardiac and respiratory diseases. Sensitive subpopulations include children, the elderly, and individuals with pre-existing cardiopulmonary disease.	This standard applies to fine suspended matter as measured by PM2.5 sampler, which collects 50% of all particles of 2.5 [MICRO]m aerodynamic diameter and collects a declining fraction of particles as their diameter increases, and an increasing fraction of particles as their diameter decreases, reflecting the characteristics of lung deposition.
Lead (Particulate)	1.5 [MICRO]g/m³ AIHL Method No. 54 (December 1974) (Atomic Absorption) or average equivalent	30 day average	Increased body burden, impairment of blood formation and nerve conduction
Hydrogen Sulfide	0.03 ppm. cadmium hydroxide STRactan Method	1 hour	Exceeds the odor threshold
Nitrogen Dioxide	0.18 ppm,	1 hour	a. Short-term exposures may lead to adverse health effects in asthmatics: increased airway reactivity and enhanced allergic response after allergen challenge.	a. Both standards are intended to prevent adverse health effects.
			b. Contribution to atmospheric discoloration.	b. The 1 hour standard imposes an upper limit on adverse effects on welfare, including atmospheric discoloration by NO₂.
	0.030 ppm	Annual	Longer term exposures may lead to increased respiratory symptoms and medication use in asthmatics, emergency room visits for asthma in children, hospitalization for respiratory and cardiovascular disease, and premature mortality.
	Gas Phase Chemiluminescence**		Longer term exposures may also lead to changes in lung function growth in children, symptoms in asthmatic children, and pre-term birth. Children may be more susceptible to the potential effects of nitrogen dioxide on the developing lung.
Sulfates	25 [MICRO]g/m³ total	24 hours	a. Decrease in ventilatory function	This standard is based on a Critical Harm
	sulfates, MLD		b. Aggravation of asthmatic symptoms	Level, not a threshold value.
	Method 007		c. Aggravation of cardiopulmonary disease
			d. Vegetation damage
			e. Degradation of visibility
			f. Property damage

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* The list of California Approved Samplers may be obtained from the Air Resources Board, Monitoring and Laboratory Division, P.O. Box 2815, Sacramento, CA 95814. Any equivalent procedure which can be shown to the satisfaction of the Air Resources Board to give equivalent results at or near the level of the air quality standard may be used.

** These standards are violated when concentrations exceed those set forth in the body of the regulation. All other standards are violated when concentrations equal or exceed those set forth in the body of the regulation.

*** Applicable statewide unless otherwise noted.

**** These standards are violated when particle concentrations cause measured light extinction values to exceed those set forth in the regulations.

Cal. Code Regs. Tit. 17, § 70200

1. Amendment filed 9-18-89; operative 10-18-89 (Register 89, No. 39). For prior history, see Register 88, No. 27.
2. Amendment filed 6-29-92; operative 7-29-92 (Register 92, No. 27).
3. Amendment filed 6-5-2003; operative 7-5-2003 (Register 2003, No. 23).
4. Amendment filed 4-17-2006; operative 5-17-2006 (Register 2006, No. 16).
5. Amendment filed 2-19-2008; operative 3-20-2008 (Register 2008, No. 8).

Note: Authority cited: Sections 39600, 39601(a) and 39606, Health and Safety Code. Reference: Sections 39014, 39606, 39701 and 39703(f), Health and Safety Code; and Western Oil and Gas Ass'n v. Air Resources Bd. (1984) 37 Cal.3d 502.