Air Quality Standards
The Clean Air Act, which was last amended in 1990, requires EPA to set National Ambient Air Quality Standards (40 CFR part 50) for six ...
Reviewing National Ambient Air Quality Standards (NAAQS)
This area provides information about the current or prior review of any of the six NAAQS. These pollutants are common in outdoor air, ...
Air Quality Index (AQI) Basics - AirNow.gov
Think of the AQI as a yardstick that runs from 0 to 500. The higher the AQI value, the greater the level of air pollution and the greater the health concern ...
Air Quality Standards - World Health Organization (WHO)
This interactive tool provides a snapshot – in the form of a map – of current national air quality standards for classical pollutants (particulate matter, ...
National Ambient Air Quality Standards (NAAQS)
The Clean Air Act Amendments of 1970 instruct the U.S. Environmental Protection Agency (U.S. EPA) to set primary National Ambient Air Quality Standards (NAAQS) ...
Ambient (outdoor) air pollution - World Health Organization (WHO)
The WHO Global air quality guidelines (AQG) offer global guidance on thresholds and limits for key air pollutants that pose health risks. These ...
Air Quality Pollutants and Standards
Air Quality Pollutants and Standards · Ozone (O3) · Particulate Matter (specifically, particulate matter less than 2.5 microns in diameter (PM 2.5) and ...
National Ambient Air Quality Standards
National ambient air quality standards (NAAQS) are air quality standards whose purpose is to protect public health and the environment.
National Ambient Air Quality Standards | Hamilton County ...
The National Ambient Air Quality Standards (NAAQS) are set by the U.S. EPA to protect public health and the environment. U.S. EPA has set NAAQS for six ...
Inhalable Particulate Matter and Health (PM2.5 and PM10)
What are the Ambient Air Quality Standards for Particulate Matter? ; PM2.5 ; Annual Average, 24-Hour Average ; National Ambient Air Quality Standard, 9 µg/m · 35 µg ...
National Ambient Air Quality Standards - Wikipedia
The U.S. National Ambient Air Quality Standards are limits on atmospheric concentration of six pollutants that cause smog, acid rain, and other health ...
National Ambient Air Quality Standards (NAAQS)
National Ambient Air Quality Standards (NAAQS) ; 1-Year Average, 9 µg/m3, Primary ; 1-Year Average, 15 µg/m3, Secondary ; 24-Hour Average, 35 µg/m3, Primary & ...
WHO Air Quality Guidelines - C40 Knowledge Hub
The guidelines provide evidenced, health-based standards for specific air pollutants that cities should adopt as air quality targets.
Attainment Status of National Ambient Air Quality Standards - NC DEQ
The National Ambient Air Quality Standards (NAAQS) are set by the U.S. Environmental Protection Agency to protect public health and the environment. These ...
Air - European Commission - Environment
The EU has established ambient air quality standards to be achieved by all EU countries. ... EU rules set national reduction commitments for five main air ...
Reconsideration of the National Ambient Air Quality Standards for ...
Based on the Environmental Protection Agency's (EPA's) reconsideration of the air quality criteria and the national ambient air quality ...
Air Quality Index - National Weather Service
The Air Quality Index (AQI) is used for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health effects might ...
Air quality standards - Washington State Department of Ecology
EPA established a list of 188 hazardous air pollutants. We regulate over 430 toxic air pollutants from commercial and industrial sources. We prioritized 21 of ...
Using Air Quality Index | AirNow.gov
The AQI for each pollutant is generally based on the health-based national ambient air quality standard for that pollutant and the scientific information that ...
National Ambient Air Quality Standards (NAAQS)
The National Ambient Air Quality Standards (NAAQS) define the maximum permissible concentrations for certain pollutants, known as criteria pollutants.