What does purple mean for air quality?

Check the AQI at www.epa.gov/

airnow

. … Yellow means air quality is moderate. Orange means air quality is unhealthy for sensitive groups — people with heart disease or lung disease such as asthma, children &amp, teens, people who are active outdoors, and older adults. Purple means air quality is very unhealthy.

What are the six levels of air quality?

These six pollutants are carbon monoxide, lead, nitrogen oxides, ground-level ozone, particle pollution (often referred to as particulate matter), and sulfur oxides.

What do purple air numbers mean?

So, basically, click on all of them, and those at the EPA and local air district sites, to arrive at a general sense of conditions. Purple (very unhealthy) and maroon (hazardous) air quality blankets the Sacramento and Bay Area regions on Nov.

What are the colors for air quality?

The colors tell you how healthy the air is to breathe that day. The colors go from Green to Yellow to Orange to Red to Purple to Maroon, each color telling you that the air is less clean than the color before. Green is the best air quality. When the AQI is green,the air is clean!

Why are purple air readings so high?

PurpleAir’s website says its sensors may appear to “read high” in wildfire smoke conditions because the density of smoke particles differs from that of other airborne particles of similar size, affecting its calculations of particle concentration.

How bad is 400 air quality?

From 201 to 300, the air is judged to be very unhealthy, children, asthmatics and people with heart or lung conditions should avoid the outdoors and all others should reduce their outdoors exertion. When the Air Quality Index exceeds 300, it is “hazardous” for everyone and may prompt emergency condition alerts.

What AQI is unhealthy?

An AQI over 150 is considered unhealthy for the general population. AQI over 101 can be unhealthy for sensitive groups and some workers with asthma and other conditions may feel unhealthy when the AQI is below 150.

How reliable is purple air?

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.

Is purple air or AirNow more accurate?

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

Why should I buy a purple air sensor?

Real-time air quality monitoring for people who care about the air. PurpleAir makes sensors that a community of citizen scientists use to collect hyper-local, real-time air quality data and share it on a map that is accessible to everyone.

How do you use purple air?

Is 500 air quality bad?

Exceeding the 500 scale indicates the situation is terrible. At 500, maximum damage is done so there is no point going beyond that. It’s a situation similar to the US Environment Protection Agency’s (EPA) hazardous level. Its recommended that people remain indoors but indoor air quality is also impacted.”

What do the AQI colors mean?

AQI colors

For example, the color orange means that conditions are “unhealthy for sensitive groups,” while red means that conditions may be “unhealthy for everyone,” and so on.

Why is the air purple?

The Purple Air sensors provide particulate matter (PM) data in communities without regulatory monitors. The data can be particularly useful during summer wildfire smoke intrusion episodes and the winter time home wood heating season.

Why are purple air and AirNow so different?

Why does the AirNow Fire and Smoke Map look different than the PurpleAir Map? … AirNow identifies potentially malfunctioning sensors based on a comparison of readings from the two fine particle sensors each PurpleAIr sensor contains, or from user reports.

What’s the highest air quality?