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PM-10 (Standard Conditions) Hourly Averages

Particle pollution (also called particulate matter or PM) is the term for a mixture of solid particles and liquid droplets found in the air. Some particles, such as dust, dirt, soot, or smoke, are large or dark enough to be seen with the naked eye. Others are so small, they can only be detected using an electron microscope. Particle pollution includes inhalable coarse particles, with diameters larger than 2.5 micrometers and smaller than 10 micrometers and fine particles, with diameters that are 2.5 micrometers and smaller. How small is 2.5 micrometers? Think about a single hair from your head. The average human hair is about 70 micrometers in diameter -- making it 30 times larger than the largest fine particle. These particles come in many sizes and shapes and can be made up of hundreds of different chemicals. Some particles, known as primary particles, are emitted directly from a source, such as construction sites, unpaved roads, fields, smokestacks or fires. Others form in complicated reactions in the atmosphere of chemicals such as sulfur dioxides and nitrogen oxides that are emitted from power plants, industries and automobiles. These particles, known as secondary particles, make up most of the fine particle pollution in the country.

Coarse particulates (PM-10) come from sources such as windblown dust from the desert or agricultural fields (sand storms) and dust kicked up on unpaved roads by vehicle traffic. PM-10 data is the near real-time measurement of particulate matter 10 microns or less in size from the surrounding air. This measurement is made at standard conditions, meaning it is corrected for local temperature and pressure.

Use the controls below to select a different date or parameter and to control cell highlighting based on measured PM-10 (Standard Conditions) levels. Click on the Generate Report button once you have made your selections.

Click on the Plot Data button once the tabular report has been generated to open a separate window containing data plots.
Select a date: Time Format: Select a Parameter:
PM-10 (Standard Conditions) Highlights:  Moderate   Unhealthy for Sensitives   Unhealthy   Very Unhealthy   Hazardous  
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PM-10 (Standard Conditions) Hourly Averages for Monday, October 18, 2021.
measured in ug/cu meter (25 c)
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00
Clark County - all times are in PST
24  1 18.2820.1028.6824.0631.3930.2832.3735.7378.98114.7791.5556.3064.5934.9214.0118.3512.5816.1622.7420.5618.98 FEW 24  1 1 R DAQ
43  1 24.1318.8821.5524.7540.4426.0044.1995.3349.0531.4242.9839.0353.6531.1423.6230.2726.5125.8229.0834.2229.66 FEW 43  1 1 R DAQ
44  1 29.4433.0619.6017.3819.0125.4569.3457.2639.7845.1957.5358.0958.5335.8237.5726.5327.2428.0832.4727.1617.40 FEW 44  1 1 R DAQ
71  1 22.5423.0918.7722.0736.9425.1634.9579.0857.0945.2936.9946.9565.3519.4324.2529.4227.9824.9023.1935.2623.36 FEW 71  1 1 R DAQ
73  1 24.0722.8217.8225.5920.9423.0827.4041.8837.8727.8040.8156.6147.4115.6517.2617.0121.3923.8726.8022.1829.45 FEW 73  1 1 R DAQ
75  1 35.1330.9728.5027.0231.1434.1234.5964.69120.6178.2170.0068.4178.9625.7226.7732.1528.3837.4229.2726.8035.39 FEW 75  1 1 R DAQ
298  1 38.7321.1220.7821.7818.0118.6166.3495.6777.1797.92179.9092.8586.9536.1920.2528.2628.5444.4345.9445.2222.29 FEW 298  1 1 R DAQ
299  1 26.7221.8822.2923.1522.1636.0599.09119.97118.0074.12206.6889.3384.1645.2034.0926.3730.8226.6829.4230.7714.58 FEW 299  1 1 R DAQ
540  1 32.9225.1922.0222.4020.0938.67134.2380.77110.8973.2286.3472.3459.6934.3325.2729.6129.6326.3529.8537.6435.38 FEW 540  1 1 R DAQ
561  1 39.0729.6520.0727.3029.6953.2486.9691.3178.6142.2592.2759.7168.4235.0427.5033.1029.3929.0333.3930.2634.35 FEW 561  1 1 R DAQ
602  1 25.5322.7621.9821.3222.8320.4224.7134.5889.63154.0179.0930.9038.5865.5849.64 LOST LOST LOST LOST NA NA NA 602  1 1 R DAQ
1019  1 20.5019.4421.4021.7718.1042.1367.8735.3229.3940.6021.7035.4569.7358.5140.0430.3923.8414.7912.4617.5013.74 FEW 1019  1 1 R DAQ
1502  1 41.5131.4130.4232.0244.0033.4049.8383.6452.9139.1056.1259.4257.7523.0420.8829.6427.0623.8426.7728.8832.17 FEW 1502  1 1 R DAQ
2003  1 43.8434.6925.2423.8729.0742.3166.28111.90119.00127.29109.9660.9881.8548.0226.7333.1827.9231.1234.3741.6936.98 FEW 2003  1 1 R DAQ
- These sites are maintained and operated by Clark County Department of Air Quality.

DAQ does not certify the validity or quality of data it hosts from other monitoring entities.
Maximum values for the day are bold within the table. Minimum values are bold italic.
 R - Data from this instrument meets EPA quality assurance criteria for regulatory purposes.

PLEASE NOTE: This data has not been verified by the Clark County Department of Air Quality and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from Clark County Department of Air Quality ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.