Highest Readings by Year
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Air Quality Monitoring

Highest Readings by Year
Air Resource Management
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 2023


CO Averages

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

DEC-31 0.7 0.679
DEC-30 0.4 0.449
DEC-01 0.4 0.436
JAN-16 0.4 0.474
OCT-03 0.4 0.503
JAN-11 0.4 0.386
JAN-17 0.4 0.412
FEB-01 0.3 0.431
MAR-11 0.3 0.402
NOV-09 0.3 0.445
 
Date
Max 1 Hour Average
 

DEC-31 0.679  
SEP-07 0.677  
SEP-14 0.510  
OCT-03 0.503  
MAY-30 0.494  
DEC-08 0.493  
MAR-02 0.491  
JAN-16 0.474  
JAN-01 0.458  
DEC-30 0.449  

NO2 Averages

NO2 data below are shown in Parts Per Billion (PPB)
This site did not monitor NO2 during 2023.

Ozone Averages

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

APR-18 61 66
MAY-04 61 68
MAR-30 60 67
MAY-05 60 67
JUN-26 60 73
OCT-03 59 70
JUN-30 58 66
OCT-23 58 68
FEB-14 57 63
MAY-03 57 58
 
Date
Max 1 Hour Average
 

JUN-26 73  
OCT-03 70  
MAY-04 68  
MAY-10 68  
OCT-23 68  
MAR-30 67  
MAY-05 67  
JUN-29 67  
APR-18 66  
JUN-30 66  

PM 2.5 Averages

PM 2.5 data below are shown in Micrograms Per Cubic Meter (μg/m3)
Date
Daily Average
 
OCT-03 34.9  
DEC-31 23.9  
FEB-24 17.6  
AUG-22 16.6  
OCT-02 16.5  
FEB-25 16.2  
MAR-03 15.8  
JUL-25 14.9  
AUG-23 14.4  
JAN-01 14.3  
* = Value Not Available

PM 10 Averages

PM 10 data below are shown in Micrograms Per Cubic Meter (μg/m3)
This site did not monitor PM 10 during 2023.

SO2 Averages

SO2 data below are shown in Parts Per Billion (PPB)
Date
Max Daily (24-Hour) Average
1 Hour Average
FEB-09 1.740 8.276
JAN-30 1.640 16.984
FEB-02 1.600 7.862
MAR-04 1.550 4.756
MAY-06 1.530 4.556
FEB-21 1.490 6.460
FEB-14 1.470 7.355
MAR-01 1.460 10.852
FEB-17 1.390 5.891
FEB-07 1.370 6.716

Date
Max 1 Hour Average
 
JAN-30 16.984  
MAR-01 10.852  
FEB-09 8.276  
FEB-02 7.862  
FEB-14 7.355  
FEB-07 6.716  
FEB-21 6.460  
FEB-17 5.891  
JAN-16 5.800  
JUL-21 5.356  
* = Value Not Available

Federal Air Quality Standard
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