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Health Standards

10Green health standards are always based on the strictest standards available. For details concerning health standards see table below.

Carbon Monoxide

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard5 ppmactual readings
California ARB20 ppm1-hour
California ARB9 ppm8-hour
California ARBLake Tahoe6 ppm8-hour
Canada NAAQOsMax Acceptable Level30 ppm1-hour
Canada NAAQOsMax Acceptable Level13 ppm8-hour
Canada NAAQOsMax Desirable Level13 ppm1-hour
Canada NAAQOsMax Desirable Level5 ppm8-hour
Canada NAAQOsMax Tolerable Level17 ppm8-hour
EPA NAAQSPrimary35 ppm1-hour
EPA NAAQSPrimary9 ppm8-hour
European Commission AQS10 mg/m²8-hour

Large Particulates

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard20 µg/m³actual readings
California ARB20 µg/m³annual
California ARB50 µg/m³24-hour
EPA NAAQSPrimary and Secondary150 µg/m³24-hour
European Commission AQS40 µg/m³annual
European Commission AQS50 µg/m³24-hour
World Health OrganizationAir Quality Guideline20 µg/m³annual
World Health OrganizationAir Quality Guideline50 µg/m³24-hour
World Health OrganizationInterim target-170 µg/m³annual
World Health OrganizationInterim target-1150 µg/m³24-hour
World Health OrganizationInterim target-250 µg/m³annual
World Health OrganizationInterim target-2100 µg/m³24-hour
World Health OrganizationInterim target-330 µg/m³annual
World Health OrganizationInterim target-375 µg/m³24-hour

Small Particulates

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard10 µg/m³actual readings
California ARB12 µg/m³annual
EPA NAAQSPrimary and Secondary15 µg/m³annual
EPA NAAQSPrimary and Secondary35 µg/m³24-hour
European Commission AQS25 µg/m³annual
World Health OrganizationAir Quality Guideline10 µg/m³annual
World Health OrganizationAir Quality Guideline25 µg/m³24-hour

Ozone

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard0.05 ppmactual readings
California ARB0.09 ppm1-hour
California ARB0.07 ppm8-hour
Canada NAAQOsMax Acceptable Level15 ppbannual
Canada NAAQOsMax Acceptable Level82 ppb1-hour
Canada NAAQOsMax Acceptable Level25 ppb24-hour
Canada NAAQOsMax Desirable Level51 ppb1-hour
Canada NAAQOsMax Desirable Level15 ppb24-hour
Canada NAAQOsMax Tolerable Level153 ppb1-hour
EPA NAAQSPrimary and Secondary0.12 ppm1-hour
EPA NAAQSPrimary and Secondary0.08 ppm8-hour
European Commission AQS120 µg/m³8-hour
World Health OrganizationAir Quality Guideline100 µg/m³8-hour
World Health OrganizationInterim target-1160 µg/m³8-hour

Nitrogen Dioxide

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard20 ppbactual readings
California ARB0.03 ppmannual
California ARB0.18 ppm1-hour
Canada NAAQOsMax Acceptable Level50 ppbannual
Canada NAAQOsMax Acceptable Level213 ppb1-hour
Canada NAAQOsMax Acceptable Level106 ppb24-hour
Canada NAAQOsMax Desirable Level32 ppbannual
Canada NAAQOsMax Tolerable Level553 ppb1-hour
Canada NAAQOsMax Tolerable Level106 ppb24-hour
EPA NAAQSPrimary100 ppb1-hour
EPA NAAQSPrimary and Secondary53 ppbannual
European Commission AQS40 µg/m³annual
European Commission AQS200 µg/m³1-hour
World Health OrganizationAir Quality Guideline40 µg/m³annual
World Health OrganizationAir Quality Guideline200 µg/m³1-hour

Sulfur Dioxide

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard7.63 ppbactual readings
California ARB0.25 ppm1-hour
California ARB0.04 ppm24-hour
Canada NAAQOsMax Acceptable Level23 ppbannual
Canada NAAQOsMax Acceptable Level334 ppb1-hour
Canada NAAQOsMax Acceptable Level115 ppb24-hour
Canada NAAQOsMax Desirable Level11 ppbannual
Canada NAAQOsMax Desirable Level172 ppb1-hour
Canada NAAQOsMax Desirable Level57 ppb24-hour
Canada NAAQOsMax Tolerable Level306 ppb24-hour
EPA NAAQSPrimary0.03 ppmannual
EPA NAAQSPrimary75 ppb1-hour
EPA NAAQSPrimary0.14 ppm24-hour
EPA NAAQSSecondary0.50 ppm3-hour
European Commission AQS350 µg/m³1-hour
European Commission AQS125 µg/m³24-hour
World Health OrganizationAir Quality Guideline500 µg/m³10-minute
World Health OrganizationAir Quality Guideline20 µg/m³24-hour

Heavy Metals

Arsenic

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard0.006 µg/m³actual readings
European Commission AQS6 ng/m³1-year

Cadmium

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard0.005 µg/m³actual readings
European Commission AQS5 ng/m³1-year

Lead

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard0.15 µg/m³actual readings
California ARB1.50 µg/m³30-day
EPA NAAQSPrimary and Secondary0.15 µg/m³rolling 3-month
European Commission AQS0.50 µg/m³annual

Nickel

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard0.02 µg/m³actual readings
European Commission AQS20 ng/m³1-year

Carbon Dioxide

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard280 ppmactual readings
Ice Core RecordPre-Industrial Level280 ppm1-hour

Other Greenhouse Gases

Methane

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard680 ppbCactual readings

Nitrous Oxide

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard270 ppbactual readings

Other Pollutants

Benzene

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard9.40 ppbCactual readings
European Commission AQS5 µg/m³1-year

Polycyclic Aromatic Hydrocarbons

OrganizationTypeStandardAveraging Period
10Green10Green Health Standard1.00 ng/m³actual readings
European Commission AQS1.00 ng/m³1-year

• The Standards Organizations •

California ARB

The California Environmental Protection Agency Air Resources Board (ARB) has established a set of Ambient Air Quality Standards (AAQS) to identify outdoor pollutant levels considered safe for the public.

See the complete set of AAQS.

Canada NAAQOs

The Canada National Ambient Air Quality Objectives (NAAQOs) identify benchmark levels of protection for people and the environment.

See the complete set of NAAQOs.

EPA NAAQS

The United States Environmental Protection Agency is required, by the Clean Air Act, to set National Ambient Air Quality Standards for pollutants that are considered harmful to the public and the environment.

See the complete set of NAAQS.

European Commission AQS

The European Commission has established health based Air Quality Standards (AQS) for air pollutants.

See the complete set of AQS.

World Health Organization

The World Health Organization (WHO) maintains a set of Air Quality Guidelines for common air pollutants.

See the Air Quality Guidelines

Climate Change Institute

An initiative of the Climate Change Institute at the University of Maine.