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Daily Maximum Eight-Hour Ozone Averages for April 2018

The table below lists the peak daily maximum eight-hour ozone concentrations measured in April 2018 in each community where the IDEM measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion.

Use the selection boxes below to customize this report. You may select a different month, a different year, a different report format, and whether or not to include time on the report. Click on the Generate Report button once you have made your selections.

Month:Year:Report Format: Include time:
Include time
Highlight with AQI colors
AreaMonitoring SitePOCApril 2018POCMonitoring Site
12345678910111213141516171819202122
North West
Hammond-141st St1373936383444314042423642292931NVNANANANANANA1Hammond-141st St
Ogden Dunes14244374240463849474237492630373948445650NVNA1Ogden Dunes
Michigan City-W. Michigan Blvd14344394238463650494640492536394450465855NVNA1Michigan City-W. Michigan Blvd
Valparaiso14244364042453545424746513233343743385247NVNA1Valparaiso
Gary-IITRI14144283539443549474140492732353049455549NVNA1Gary-IITRI
LaPorte-E. Lincolnway14445404341473747464644524033354148385551NVNA1LaPorte-E. Lincolnway
AreaMonitoring SitePOCApril 2018POCMonitoring Site
12345678910111213141516171819202122
North Central
South Bend-Shields Dr14346353842453747424547514635353942385151NVNA1South Bend-Shields Dr
Bristol1NANANA4344484048454650524536364042345150NVNA1Bristol
Potato Creek State Park145NANA4444484051474949545037373947415351NVNA1Potato Creek State Park
Granger-Beckley St14545384345483948454849524636364143385251NVNA1Granger-Beckley St
AreaMonitoring SitePOCApril 2018POCMonitoring Site
12345678910111213141516171819202122
North East
Fort Wayne-Beacon St14547294243454149394446545036363541385150NVNA1Fort Wayne-Beacon St
Leo HS14646314344474249444548545238383741415150NVNA1Leo HS
Roanoke Elem. School1404328383841NANANANANANANA32313337NA5049NVNA1Roanoke Elem. School
AreaMonitoring SitePOCApril 2018POCMonitoring Site
12345678910111213141516171819202122
West Central
Terre Haute-Lafayette Ave13942404143454348464646584748354053454948NVNA1Terre Haute-Lafayette Ave
Flora14144364243424148424341484340364144355050NVNA1Flora
Sandcut13944404244454248454746594849354054465149NVNA1Sandcut
West Union14040NANANANANANA464446574648374154485149NVNA1West Union
AreaMonitoring SitePOCApril 2018POCMonitoring Site
12345678910111213141516171819202122
East Central
Emporia14446354142454448414847585243363945445149NVNA1Emporia
Albany14444344243444343384747605339343942335147NVNA1Albany
Indpls-Washington Park14241343839444245384543544843343647425049NVNA1Indpls-Washington Park
Indpls-Harding St14344353843434449384445584945343649435051NVNA1Indpls-Harding St
Indpls-Ft. Harrison1444535394246NVNANA4847585245353849455353NVNA1Indpls-Ft. Harrison
Monrovia14042393944444146414345554946343749454947NVNA1Monrovia
Whitestown14244363943444246414643564846353847425149NVNA1Whitestown
Avon14141374042444244414445564945343749434949NVNA1Avon
Fairland142433740474544473844475851473638484650NVNANA1Fairland
Noblesville-191st St14244353942454247414646575142353945405049NVNA1Noblesville-191st St
Hope14444374347484649454247585347414053495251NVNA1Hope
Indpls - I-70 E13542323338373546352842534942322936383939NVNA1Indpls - I-70 E
Kokomo - E. Vaile Ave.14346354143434147424445554740354042365049NVNA1Kokomo - E. Vaile Ave.
Helmsburg14344394348504649454349NANA49384054515352NVNA1Helmsburg
AreaMonitoring SitePOCApril 2018POCMonitoring Site
12345678910111213141516171819202122
South West
Boonville13837404245464644484143544946363955554752NVNA1Boonville
Evansville-Buena Vista Rd13634404243444442474140534844353852554549NVNA1Evansville-Buena Vista Rd
Inglefield13735394244454443464243555045363852544649NVNA1Inglefield
St. Philips13737414346464345494345565047374053574850NVNA1St. Philips
Leopold14036394447484846504447575446343957555054NVNA1Leopold
Dayville13837394344454544484241524442353952534550NVNA1Dayville
Plummer14041414346464446464144554846353952505152NVNA1Plummer
AreaMonitoring SitePOCApril 2018POCMonitoring Site
12345678910111213141516171819202122
South East
New Albany13934334141474744464043555244333755524549NVNA1New Albany
Charlestown State Park13837334346484747484443555546343857505152NVNA1Charlestown State Park
Brownstown14340394447484646444144555046374151495150NVNA1Brownstown
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NV - There are not enough valid eight-hour averages for this day (there must be eighteen valid eight-hour averages).
NA - Data not available.

Interpreting the AQI

Air Quality Index

Each NAAQS pollutant has a separate AQI scale, with an AQI rating of 100 corresponding to the concentration of the Federal Standard for that pollutant. Additional information about the AQI and how it can be used is available from the EPA's AirNow web site.

Place your mouse pointer over the scale displayed above to view information about the Air Quality Index, and each of the rating levels.

The actual index calculation is different for each parameter measured and is specified by the EPA. The following table shows the various breakpoints used in calculating the AQI.

AQI Breakpoint Definitions
AQI Range 1hr Ozone
in ppm
8hr Ozone
in ppm
0 - 50 Not Defined 0 - 0.054
51 - 100 Not Defined 0.055 - 0.070
101 - 150 0.125 - 0.164 0.071 - 0.085
151 - 200 0.165 - 0.204 0.086 - 0.105
201 - 300 0.205 - 0.404 0.106 - 0.200
301 - 400 0.405 - 0.504 0.201 - 0.2011
401 - 500 0.505 - 0.604 Not Defined
500+ Not Defined Not Defined

PLEASE NOTE: This data has not been verified by the IDEM 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 IDEM 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.