[8] Helvarg D. (2019, December 20). Current and forecast air quality data for San Francisco, California Make Your Air 99.9% Pure‎ Order Air Purifier. [3] Ray S, Miller B, and Jones J. Furthermore, during instances of higher pollution levels, either due to vehicular activity or the occurrence of a forest fire (or a combination of both), pollution levels can quickly climb to the point where they become to have the potential to cause several negative effects upon inhalation. Our recently redesigned site highlights air quality in your local area first, while still providing air quality information at state, national, and world views. Read the air pollution in San Francisco, California with AirVisual. [4] Cal-Fire - Ranch Fire. There is no Spare the Air Alert in effect. The City and County of San Francisco developed the Air Quality Element of the General Plan in order to improve air quality and achieve state and federal standards. In the case of San Francisco, waters from the Pacific Ocean are cold and reduce ground temperatures in surrounding areas. Read the air pollution in San Francisco, San Francisco with AirVisual. For context, this compares to a similar rating in New York during 2019 (7 μg/m3), and represents a healthier level of air quality than other cities such as Los Angeles (12.7 μg/m3), London (11.4 μg/m3) and Paris in France (14.7 μg/m3). Get real-time, historical and forecast PM2.5 and weather data. (2020). Generally, air quality in San Francisco is at its best in the spring, as temperatures gradually warm and the forest undergrowth is still wet from the frequent rains of the winter months. Get real-time, historical and forecast PM2.5 and weather data. San Francisco, along with Sebastapol in the North Bay, recorded an AQI of 186, the worst daily air quality of any other location in the past 25 days when the Bay Area has been impacted by … During cold conditions, occasionally a layer of warmer air can become held above a cooler of ground-level air, when usually the opposite arrangement is true. (2020). The consequences of this has been a reduction in amount of days with an “unhealthy” rating of air quality. November’s high average reading can be partly attributed to the Ranch fire, which burned more than 2,534 acres of forestland, releasing high amounts of noxious fumes and particulate pollution into the air.4. Maynard Street Air Quality Index (AQI) is now Good. Despite fewer power plants and industrial businesses as well as a growing mix of cleaner energy, San Francisco still experiences periods of unhealthy air quality. By contrast, in regards to when air quality is at its worst, the months of January, November and December in 2019 emerged as the most polluted in terms PM2.5 levels, with readings of 10.7 μg/m3, 14.5 μg/m3, and 8.2 μg/m3 respectively. The 2020 August Complex fire burned for more than 55 days, surpassing a million scorched acres and becoming the largest fire in California history.9 During this period, San Francisco air quality levels reached “unhealthy” or worse levels for more than 10 combined days. For example, an AQI value of 50 or below represents good air quality, while an AQI value over 300 represents hazardous air quality. 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