California Code of Regulations › Title 17 - Public Health › Division 3 - Air Resources › Chapter 1 - Air Resources Board › Subchapter 1.5 - Air Basins and Air Quality Standards › Article 2 - Ambient Air Quality Standards › Section 70200 - Table of Standards ***

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
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
__________
* 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.
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.