『Daily Air Quality Report for Los Angeles』のカバーアート

Daily Air Quality Report for Los Angeles

Daily Air Quality Report for Los Angeles

著者： Quiet. Please
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 Stay informed with the 'Air Quality Report for Los Angeles' podcast, your daily source for up-to-date information on air pollution levels, smog alerts, and environmental conditions in LA. Whether you're a resident, commuter, or just curious about the city's air quality, tune in for expert analysis and practical tips to protect your health and the environment. Subscribe now for essential air quality updates in Los Angeles

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  • LA AIR QUALITY MOSTLY GOOD TO MODERATE TODAY

    LA AIR QUALITY MOSTLY GOOD TO MODERATE TODAY
    2025/09/13
    Today’s air quality in Los Angeles is generally good to moderate, with most regions experiencing clean air and some areas reporting only slightly elevated levels of particulate matter and ozone. The official forecast shows Air Quality Index values ranging from 39 to 58 across the city, indicating good to moderate conditions depending on the location and time of day. Central Los Angeles County, East San Fernando Valley, and East San Gabriel Valley show moderate air quality with AQI values between 53 and 58, primarily due to fine particulate matter (PM2.5) and ozone levels, while coastal and western areas report AQI values near 39, considered good and safe for outdoor activity[2].

    Throughout 2025, Los Angeles air quality has shown improvement when compared to previous years. The yearly average AQI so far stands at 46, which is the lowest and therefore best of the past six years. More than two-thirds of this year’s days have had air quality below the World Health Organization’s recommended limit, although about a third of the days have exceeded it, especially during wildfire events or high ozone periods. Today’s readings reflect this positive trend, with cleanest levels observed in the early morning and late evening hours[1].

    Despite these improvements, residents with pre-existing respiratory or heart conditions are still advised to take precautions during times when the AQI approaches the moderate threshold. Official health guidance recommends limiting strenuous outdoor activities, especially in areas and times of day where PM2.5 or ozone readings are higher. Typical seasonal patterns include slightly higher air pollution from midday into the early evening, coinciding with increased traffic and sun-induced ozone formation.

    Recent UCLA-led research confirms that local wildfires, such as those in January 2025, can significantly worsen air pollution and cause localized hazardous AQI spikes. However, these events have been rare this year and do not currently impact today’s forecast[3][4].

    Overall, Los Angeles air quality today is suitable for most people to enjoy outdoor activities, with only minor precautions necessary for sensitive groups.

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  • Moderate Air Quality Persists Across Los Angeles, Some Elevated Ozone in East San Gabriel Valley

    Moderate Air Quality Persists Across Los Angeles, Some Elevated Ozone in East San Gabriel Valley
    2025/09/09
    Air quality in Los Angeles today is mostly in the moderate range, with the primary pollutant being fine particulate matter, known as PM2.5. In central Los Angeles County, the Air Quality Index, or AQI, is measured at 58, which is classified as moderate, meaning air quality is acceptable but there may be some risk for people who are unusually sensitive to air pollution. Northwest coastal and southwest Los Angeles County also report moderate AQI levels at 58 and 56, respectively. South and southeast Los Angeles County show similar AQI numbers, all in the mid-50s. This trend of moderate air quality holds across large urban and suburban sections of the county throughout the day.

    The West and East San Fernando Valley and the West San Gabriel Valley also experience moderate air quality, with AQI levels between 53 and 77. The East San Gabriel Valley, however, reaches an AQI of 101 for ozone, which is considered unhealthy for sensitive groups. Individuals with respiratory conditions, young children, and older adults in that area are advised to limit prolonged or heavy outdoor exertion.

    Historical air quality data from this month indicates an improvement compared to previous years, with the AQI trending lower, suggesting cleaner air than in the recent past. Over the last 24 hours, Los Angeles's AQI varied from a low of 43 during the early morning to a high of 60 in the evening, both readings remaining within the moderate range.

    No major spikes in pollution or hazard alerts have been issued. Residents are encouraged to follow routine guidelines, such as staying indoors during peak pollution hours if sensitive, but for the average person, outdoor activity remains generally safe in most areas of Los Angeles today[1][2].

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  • Moderate Air Quality in Los Angeles, but Wildfire Smoke Concerns Persist

    Moderate Air Quality in Los Angeles, but Wildfire Smoke Concerns Persist
    2025/09/06
    Today’s air quality in Los Angeles is classified as moderate, according to the official forecast from the South Coast Air Quality Management District. Across central, coastal, valley, and surrounding areas, the Air Quality Index readings range from the low 50s to low 90s, with most locations measuring between 53 and 67. This means particulate matter, especially fine particles known as PM2.5 and ozone, are the primary pollutants and are expected to remain at similar levels throughout the day.

    A moderate AQI indicates that air pollution levels are acceptable for the general public, but there may be a minor concern for people who are unusually sensitive to air pollution. For most individuals, outdoor activities can continue as usual. However, sensitive groups such as children, seniors, and individuals with respiratory or heart conditions may consider limiting prolonged exertion outdoors.

    Smoke and ash from ongoing wildfires in Southern California, including the Rosa, Gifford, and Gold fires, have contributed to a dusty haze across the region. These fires elevate PM2.5 concentrations, which are fine inhalable particles that can penetrate deep into the lungs and may carry toxic compounds. Health experts note that exposure can aggravate respiratory and cardiovascular conditions, producing symptoms like wheezing, cough, throat pain, or eye irritation, particularly in sensitive individuals.

    Residents are advised to monitor any changes in local conditions and follow health recommendations. Keeping windows closed, running air conditioning on recirculation, and using air purifiers can help reduce indoor exposure to wildfire smoke. For those who must go outside, wearing an N95 mask provides some protection against fine particulate matter.

    Despite the wildfire impacts, Los Angeles’s average air quality in 2025 is improved compared to recent years, with a downward trend in the region’s annual AQI. This reflects broader air quality gains, although wildfire seasons can still produce short-term spikes and localized warnings.

    The smoke advisory remains in effect, and residents should remain alert to updates from local health and air quality agencies as the wildfire situation evolves.

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