Seattle, WA

3:40 AM PDT on August 24, 2017 (GMT -0700)
First Hill | Change Station

Air Quality Index What is Air Quality Index (AQI)?

We track six criteria pollutants considered harmful to public health and the environment. Those include carbon monoxide, nitrogen dioxide, ozone, particulate matter (10µm or less and 2.5µm or less), as well as sulfur dioxide.

The Air Quality Index (AQI) is the official index for air quality across the United States. The AQI ranges from 0 to 500. The higher the AQI value, the greater the level of air pollution and the greater the health concern.

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Pollen

A measure of how much pollen is in the air in a certain area at a specific time. It is expressed in grains of pollen per square meter of air collected over 24 hours. Pollen counts tend to be highest early in the morning on warm, breezy days and lowest during chilly, wet periods.
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Air Quality & Health Tips

Carpooling reduces particulates in the air and additional unhealthy pollutants by half!

Pollen counts are highest on warm days. Best times to be outdoors is in the early morning when dew is still on the plants.

U.S. Counties Health Map & Air Pollution Monitors

Good
Moderate
Unhealthy if Sensitive
Unhealthy
Very Unhealthy
Hazardous
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Fine Particulate Matter PM2.5*
Is an air pollutant that is a concern for people's health when levels are high. PM2.5 are tiny particles in the air which reduce visibility and cause the air to appear hazy when levels are elevated.
Learn more about air pollution and your health

Nearby Pollution Monitors

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Time
Type
Level (µg/m3)
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No nearby monitors found.

Pressure

The force exerted by the weight of the atmosphere and gravity. Very high or low pressure, or rapid pressure changes can effect joints or sinuses causing discomfort.

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Forecast →

Flu Activity

This maps outbreaks of influenza (Flu) or increases in ILI cases and recent laboratory-confirmed influenza in at least half the regions of the state. Higher levels of activity can increase the risk of contagion.
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No laboratory-confirmed cases of influenza and no reported increase in the number of cases of ILI.

Small numbers of laboratory-confirmed influenza cases or a single laboratory-confirmed influenza outbreak has been reported, but there is no increase in cases of ILI.

Outbreaks of influenza or increases in ILI cases and recent laboratory-confirmed influenza in a single region of the state.

Outbreaks of influenza or increases in ILI and recent laboratory confirmed influenza in at least two but less than half the regions of the state with recent laboratory evidence of influenza in those regions.

Outbreaks of influenza or increases in ILI cases and recent laboratory-confirmed influenza in at least half the regions of the state with recent laboratory evidence of influenza in the state.

No Flu Data Available

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No Report
Local
No Activity
Regional
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Widespread

UV Index

The UV Index is a forecast of the probable intensity of skin damaging ultraviolet radiation reaching the surface during the solar noon hour. The greater the UV Index, the greater the amount of skin damaging UV radiation. The threshold for skin damage is dependent on several factors, including skin tone. Note that clouds do not block most UV light.
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Select Skin Type

-World Health Organization

{{ pyramidIndexAndLevels.currentIndexFriendly }} risk of harm from unprotected sun exposure. Limit sun exposure to {{pyramidIndexAndLevels.currentExposure}} minutes. Apply skin protection factor (SPF) 15+ sunscreen. Apply skin protection factor (SPF) 30+ and wear protective clothing (hat). Apply skin protection factor (SPF) 30+ and wear protective clothing (hat and UV-A&B sunglasses). Apply skin protection factor (SPF) 30+, wear protective clothing (hat and UV-A&B sunglasses), and make attempts to avoid the sun between 10am to 4pm. Apply skin protection factor (SPF) 30+, wear protective clothing (hat and UV-A&B sunglasses), and avoid being in the sun between 10am to 4pm.

Wind Chill & Heat

Wind Chill is the decrease in temperature felt by the body due to wind removing heat from exposed skin. Heat index combines temperature and humidity data to account for the effects of heat not evaporating from the body.
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