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Air Quality Monitoring

Highest Readings by Year

Air Resource Management
Ad Hoc Reporting

Data on this page are updated daily when complete data are received.

It is important to note that the ozone monitoring data less than three
months old viewed on this website have generally not been verified and
checked for quality assurance in accordance with federal requirements.


More Details about: Sydney
Ad Hoc Reporting

AQS # L057-3002

Sydney

 

10 Highest Daily Averages for Year 2024

 

CO Averages

CO data below are shown in Parts Per Million (PPM)
Date
Max 8 Hour Avg
1 Hour Avg

JAN-1 0.71 0.849
OCT-25 0.63 0.845
NOV-24 0.63 0.797
OCT-24 0.6 0.545
NOV-23 0.59 0.436
SEP-26 0.57 3.471
NOV-27 0.51 0.521
DEC-4 0.51 0.578
NOV-25 0.49 0.685
NOV-26 0.49 0.766
Date
Max 1 Hour Avg

SEP-26 3.471
NOV-28 0.904
JAN-1 0.849
OCT-25 0.845
NOV-24 0.797
NOV-26 0.766
NOV-25 0.685
OCT-27 0.583
DEC-4 0.578
DEC-5 0.565

NO2 Averages

NO2 data below are shown in Parts Per Billion (PPB)
This site did not monitor NO2 during 2024

Ozone Averages

Ozone data below are shown in Parts Per Billion (PPB)
Date
Max 8 Hour Avg
1 Hour Avg

OCT-15 69 79
MAR-20 62 73
FEB-26 58 63
APR-14 58 60
AUG-14 58 63
NOV-27 58 63
SEP-17 57 67
OCT-25 57 65
MAR-11 56 67
MAY-30 56 59
Date
Max 1 Hour Avg

OCT-15 79
MAR-20 73
SEP-18 69
OCT-14 68
MAR-11 67
SEP-17 67
OCT-25 65
MAR-21 64
FEB-21 63
FEB-26 63

 

PM 2.5 Averages

PM 2.5 data below are shown in Micrograms Per Cubic Meter (mg/m3)
Date
Daily Average
 

JAN-1 38.1  
OCT-25 21.2  
OCT-27 20.9  
JUL-10 20.7  
NOV-24 20.1  
FEB-14 19.7  
OCT-26 19.3  
MAR-21 16.2  
OCT-28 16.2  
FEB-21 16.1  

 

PM 10 Averages

PM 10 data below are shown in Micrograms Per Cubic Meter (mg/m3)
Date
Daily Average
 

OCT-27 130.4  
OCT-28 104.1  
OCT-25 99.3  
JUL-10 91.3  
OCT-26 71.7  
JUL-11 49.8  
OCT-24 46.3  
NOV-25 44  
NOV-12 43  
NOV-24 42.3  

SO2 Averages

SO2 data below are shown in Parts Per Billion (PPB)
Date
Max Daily (24-Hour) Avg
1 Hour Avg

DEC-27 4 37.389
JAN-1 1 1.463
JAN-3 1 2.696
JAN-5 1 3.287
JAN-6 1 1.509
JAN-8 1 5.897
JAN-9 1 6.195
JAN-11 1 1.759
JAN-12 1 1.624
JAN-13 1 1.114
Date
Max 1 Hour Avg

DEC-27 37.389
JAN-9 6.195
JAN-8 5.897
APR-14 4.359
FEB-4 3.771
FEB-29 3.749
JAN-5 3.287
FEB-11 3.158
JAN-24 3.106
FEB-26 3.059

Federal Air Quality Standard
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Last updated: March 02, 2017

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