We don’t expect more of that smoke in the near future, though the fires are still burning and the possibility of smoke later on remains. The wildfire smoke from British Columbia, which arrived earlier in the day on July 4 th, only pushed us from Good to Moderate. The majority of the pollution we saw last night was due to fireworks. This will dilute the smoke and continue to improve – when the air near the ground heats up and rises, bringing smoke with it. With another hot day today we should see good vertical mixing Quality has greatly improved and most areas are Moderate. Particularly true in Pierce County where air quality was in the Very Unhealthy Smoke from British Columbia, and fireworks led to very high air pollution last People with low socioeconomic status because they are more likely to have higher exposures and less likely to have access to healthcare.The combination of good weather (a high pressure system), wildfire.Smokers because they are more likely to already have lower lung function and lung diseases.Pregnant women because both the mother and fetus are at increased risk of health effects.Adults over age 65 because they are more likely to have unrecognized heart or lung diseases.Infants and children under 18 because their lungs and airways are still developing and they breathe more air per pound of body weight than adults.Prior history of heart attack or stroke.Existing heart or circulatory problems, such as dysrhythmias, congestive heart failure, coronary artery disease, and angina.Respiratory infections, such as pneumonia, acute bronchitis, bronchiolitis, colds, or flu.Lung diseases such as asthma or chronic obstructive pulmonary disease (COPD), including bronchitis and emphysema.People most likely to have health problems from breathing smoke include: Several groups of people, especially those with pre-existing heart and lung conditions, are more at-risk for severe health impacts. Most people are likely to have minor symptoms. Inhaling smoke is not good for anyone, even healthy people. This means the air quality is not meeting the federal, health-based air quality standard. If the AQI is over 100 then it is in the Unhealthy for Sensitive Groups/Orange range. Why is the AQI updated only once an hour? Learn more about the AQI and NowCast calculations. The NowCast is a very effective tool to report near real-time air quality that correlates to the health-based standards.
For ozone, the standard is an eight-hour average, and for particle pollution it is a 24-hour standard. Why don’t we provide a one-hour, stand-alone value? Because there is not a one hour health-based standard. More recent hourly air pollution readings (e.g., last three hours) are given greater weight in determining the NowCast index value when air quality is changing more rapidly, as may be the case when wildfire smoke affects air quality. The NowCast calculation is designed to be responsive to rapidly changing air quality conditions. To address this, EPA developed the NowCast to report air quality that is near real-time (referred to as “Current Air Quality” reported at the top of this webpage.) A rolling 24-hour average report also isn’t very useful when conditions rapidly change, such as during a dust storm or wildfire. This means the official daily AQI is not known until the following day. For particulate matter, it is a 24-hour average, midnight-to-midnight. Each pollutant has its own health-based standard.
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