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Yet for some reason, Walla Walla recorded quite a poor level when other cities were seeing much better air quality because of the lower rates of pollution. Many small factories and non-essential production units were also temporarily closed which again lead to an improvement in air quality. This had the effect of drastically reducing pollution within the city center.
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Many vehicles were temporarily unused as their drivers were not required to work from the office, instead, they were furloughed and allowed to work from home.
This figure is quite surprising because of the restrictions imposed by the COVID-19 situation.
Unfortunately in 2020, the air quality slipped down into the “Moderate” category with a 13.3 µg/m³ figure. The following two years showed improved figures of 7.2 and 7.8 µg/m³, respectively which was less than 10 µg/m³ which is the target figure as recommended by the World Health Organisation (WHO). Historically, air quality records have been held since 2017 when the average figure was recorded as being 12.7 µg/m³ or “Moderate”. Readings between 10 and 12 µg/m³ qualify for such a category. With figures such as these, the air quality is considered to be “Good”. December and January were the next worse with figures of 11.6 and 11.4 µg/m³, respectively. Readings between 55.5 and 150.4 µg/m³ qualify for this bracket. Looking back at the figures for 2020, released by, it is easily seen that the worst month for air pollution was during September when the average figure was 69.1 which placed it firmly in the “Unhealthy” category. Is the level of air pollution always high in Walla Walla? The World Health Organization (WHO) has a recommended level of 10 µg/m³, so with this figure, it can be seen to be over seven times the recommended level, although no level is considered to be safe. The only recorded figure in Walla Walla was for PM2.5 which was 77.9 µg/m³. If data is unavailable for all 6 pollutants, a figure can still be calculated by using what figures there are. It can be used as a standard when comparing air quality in other cities around the world. This United States Air Quality Index number is calculated using the levels of six of the most prolific air pollutants, namely, nitrogen dioxide, sulfur dioxide, ozone, carbon monoxide and both sizes of particulate matter, being PM2.5 and PM10. It is in the southeastern region of Washington, around a four-hour drive from Portland, Oregon.ĭuring the middle part of 2021, Walla Walla was going through a period of “Unhealthy” air with a US AQI reading of 163. If the two suburbs are included, then the figure is closer to 45,000 people. The last census was conducted in 2019 when it was seen to have increased to 33,000, from 31,000 in 2010. Walla Walla is the largest city and county seat of Walla Walla County, Washington County. What is the current level of air pollution in Walla Walla City?