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Length of Visible Light. Length of Day. Tomorrow will be 2 minutes 10 seconds shorter. Oct Nov 4. From to , air pollution fell by As global temperatures rise with climate change and droughts become more frequent, wildfires are expected to become more numerous and severe in the future.
This phenomenon could counteract gains made by shifting to cleaner energy and transport. San Jose and the surrounding Bay area have some of the worst air quality in the United States despite relatively few power plants and industrial businesses, shifts towards cleaner energy, and a quickly evolving transportation sector with a growing share of electric vehicles.
City-wide emissions are primarily from mobile sources, including cars, heavy-duty trucks, planes, and ships from nearby ports. Marine inversions can cause air pollution to accumulate and linger in the lower atmosphere until weather conditions change. The mountains surrounding the city can also have a similar effect, additionally exacerbating marine inversions. Summertime heat, expected to worsen with climate change, is a contributor to high ozone levels in summer afternoons.
Ozone is primarily formed in the atmosphere when ultraviolet radiation from the sun causes nitrogen oxides and VOCs to react. Nonattainment ozone days, days when ozone levels exceed air quality standards set by organizations like the EPA and state, in San Jose occur almost exclusively in the summer.
Use the air pollution map of San Jose to reveal real-time pollution concentrations and wind directions, and better understand the source of unhealthy air. During a San Jose Spare the Air alert, residents are recommended to both protect their health by reducing outdoor activity and protect their outdoor environment by reducing personal emissions.
This correlates with either a PM2. Spare the Air alerts for ozone pollution, on the other hand, occur more often in the summer when temperatures are hottest. This is because ozone is a pollutant created in the atmosphere when precursor pollutants react in sunlight and temperatures warmer than 84 degrees. The hotter the temperatures, the faster ozone is likely to form.
Santa Clara County, of which San Jose is a part, experiences an average of 2. During such events, follow the recommended health precautions and avoid driving, woodburning, and barbecuing to help reduce your personal impact on the air. Smoky air has become part of the new normal in the Bay Area, especially during the peak wildfire season that spans July through November. Within a recent five-year period , there have been 3 record-breaking wildfire seasons: , and Several of California's largest wildfires in history have burned close to the Bay Area in recent years, including the largest fire in California history called the August Complex Fire and the third-largest called the SCU Lightning Complex Fire Scientists attribute the increase in wildfire activity in California and abroad to human-contributed climate change.
As temperatures rise, more water is lost to evaporation, contributing to drier conditions. In recent years, wildfires near San Jose have ignited in wilderness areas all around the Bay Area.
These fires are a threat not only to the environment but also to public health. Smoke consists of deadly PM2. Breathing this combination of pollutants has been linked to hospital visits as a result of respiratory irritation and difficulty breathing as well as to more serious effects like reduced lung function, inflammation, bronchitis, heart failure, and even early death.
Understand where fires are burning, the direction of wind, and the density of nearby smoke. In recent years, fires in Mendocino , Humboldt, Glenn, Sonoma , Napa and Fresno have all caused significant spikes in air quality. The "Approx. However, some stations reset at the wrong time, such as a few minutes after the hour. We have tried to account for this issue. Most gauges report multiple times per hour. For example, a measurement of precipitation at am could be 0. So, the accumulative total for that hour would be 0.
Finally, each hourly total for the day is summed to provide the "Approx. One other note : if the total is 0, but there was obviously rain - then the instrument is not properly distributing its data from the station.
The issue could be temporary or permanent. Rest of Today Mostly cloudy. A chance of showers and a slight chance of thunderstorms. Highs in the mid 60s.
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