The Air District is extending an air quality advisory for the Bay Area due to wildfire smoke from fires in northern Sacramento Valley through Saturday, July 12. Smoke from the Butler and Green wildfires is moving down the Sacramento Valley and is expected to continue to impact air quality in portions of the Bay Area on Saturday. Conditions can change rapidly and the amount and location of smoke at ground level is hard to predict. The public can check for real-time smoke pollution levels in their local area with the U.S. EPA’s Fire and Smoke Map. Smoky, hazy skies may be visible, the smell of smoke is possible and air quality may become unhealthy at times on Saturday.
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Advisory
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Air Quality Advisory
Smoke from the fires in Northern Sacramento Valley is expected to impact air quality in the eastern portion of the Bay Area down to Santa Clara Valley on Friday and Saturday. Residents in affected areas should stay alert to news coverage and health warnings related to smoke. Check air quality at fire.airnow.gov and take steps to protect your health from smoke. Learn how at www.baaqmd.gov/wildfiresafety. Pollution levels are not expected to exceed the national 24-hour health standard. A Spare the Air Alert is not in effect.
Advisory
Air Quality Advisory
Smoke from the fires in Northern Sacramento Valley is expected to impact air quality in the eastern portion of the Bay Area down to Santa Clara Valley on Friday and Saturday. Residents in affected areas should stay alert to news coverage and health warnings related to smoke. Check air quality at fire.airnow.gov and take steps to protect your health from smoke. Learn how at www.baaqmd.gov/wildfiresafety. Pollution levels are not expected to exceed the national 24-hour health standard. A Spare the Air Alert is not in effect.
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納帕縣 (Napa County)
瞭解納帕縣，包括它的氣候、潛在空氣污染問題及目前的空氣品質。您還可以查看納帕縣即將發生的空氣局事件，閱讀瞭解當地為改善空氣品質所做的努力。
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The Air District is issuing an air quality advisory for the Bay Area due to wildfire smoke from fires in northern Sacramento Valley for today, Thursday, July 10, and Friday, July 11. Smoke from the Butler and Green wildfires has been moving down the Sacramento Valley and is expected to impact air quality in the eastern portion of the Bay Area down to Santa Clara Valley on Thursday and Friday. Conditions can change rapidly and the amount and location of smoke at ground level is hard to predict. The public can check for real-time smoke pollution levels in their local area with the U.S. EPA’s Fire and Smoke Map. Smoky, hazy skies may be visible, the smell of smoke is possible and air quality may become unhealthy at times on Thursday and Friday.
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The Air District urges residents to celebrate responsibly this Fourth of July by avoiding personal fireworks, which can elevate air pollution and increase wildfire danger. Fireworks release smoke and fine particulate matter pollution, contributing to temporary spikes in unhealthy air quality.
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氣候
納帕谷兩側的山脈阻隔了全年大部分的西北盛行風。納帕縣陽光充足，夏季時山谷裡十分溫暖，尤其是北端。冬季通常氣候溫和，夜間涼爽，白天氣溫溫和到適中。冬天時，山谷的北段溫度稍低。全縣通常以靜風為主。海拔低的地區年平均降水量在 24 英寸左右，山裡的年平均降水量在 40 英寸以上。
納帕縣 (Napa County) 的氣候還受到區域性灣區氣候的影響。
納帕縣的空氣品質
臭氧和細顆粒物污染（即 PM2.5）是影響舊金山灣區的主要區域性空氣污染物。臭氧問題主要發生在夏季，細顆粒物污染主要發生在冬季。
在納帕縣，臭氧很少超過健康標準，PM2.5 偶爾會達到不健康的濃度。納帕縣 PM2.5 超標的原因有多個。 首先，全縣大部分地區背風，把 PM2.5 困在了纳帕谷內部。
其次，大部分地區靠北，無法受到聖帕布洛灣 (San Pablo Bay) 的氣溫調節作用影響，因此納帕縣夜間的溫度是灣區最低的。這導致更多的人使用火爐，焚燒木材，進而使 PM2.5 的水平升高。最後，冬季吹的東風經常把中央谷地細顆粒物含量較高的空氣運送到卡奇尼茲海峽 (Carquinez Strait)，然後再吹到西面的索拉諾縣和南面的納帕縣。
資源團隊
納帕縣的愛惜空氣資源團隊在當地社區倡導降低空氣污染的方式。
Spare the Air Status
上次更新： 2016/11/8