What is the most reliable source for air quality information?

What is the most reliable source for air quality information?

The sensors deployed by governments around the world are typically seen as the most reliable source of air quality information.

How does AirNow get its data?

Measurements are collected by state, local or tribal monitoring agencies using federal reference or equivalent monitoring methods approved by EPA.

Is PurpleAir or AirNow more accurate?

Broadly put, PurpleAir provides more localized, more current and less accurate readings than AirNow.

Which US agency monitors the quality of the air?

EPA is dedicated to monitoring the quality of the air we breathe. OAQPS is responsible for setting the National Ambient Air Quality Standards (NAAQS), which control pollutants harmful to people and the environment.

What is the best air quality index?

AQI values at or below 100 are generally thought of as satisfactory. When AQI values are above 100, air quality is unhealthy: at first for certain sensitive groups of people, then for everyone as AQI values get higher.

Is air quality data valuable?

The Air Quality Index, developed in 1968, remains a valuable and widely used standard for signaling potentially hazardous levels of pollution to local officials and residents.

Who runs AirNow?

AirNow is a partnership of the U.S. Environmental Protection Agency, National Oceanic and Atmospheric Administration (NOAA), National Park Service, NASA, Centers for Disease Control, and tribal, state, and local air quality agencies.

What is the AirNow app?

EPA’s AirNow mobile app provides a simple interface for quickly checking current and forecast air quality information for planning daily activities and protecting your health.

How reliable is PurpleAir?

For the national data set of sensors collocated with regulatory-grade monitors, results show that PurpleAir sensors, when corrected, accurately report NowCast AQI categories 90% of the time as opposed to uncorrected PurpleAir data, which are accurate only 75% of the time.

What sensors does AirNow use?

AirNow is using data from PurpleAir for the pilot, because EPA researchers have used a scientific approach to develop a correction equation and quality assurance steps for PurpleAir sensors.

What organization sets the national air quality standards in the US?

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 principal pollutants (“criteria” air pollutants) which can be harmful to public health and the environment.

How does the EPA measure air quality?

An example of direct measurement of the pollutant of concern is the use of a Nitrogen Oxides (NOx) CEMS to monitor the NOx concentration (emissions level) of the effluent from a process stack on a stationary source that must comply with a NOx emissions limit.