Ozone Hourly Averages

Ozone is a form of oxygen with three atoms instead of the usual two atoms. It is a photochemical oxidant and, at ground level, is the main component of smog. Unlike other gaseous pollutants, ozone is not emitted directly into the atmosphere. Instead, it is created in the atmosphere by the action of sunlight on volatile organic compounds and nitrogen oxides.

In general, higher levels of ozone usually occur on sunny days with light winds, primarily from March through October. An ozone exceedance day is counted if the measured eight-hour average ozone concentration exceeds the standards.

Use the controls below to select a different date or parameter and to control cell highlighting based on measured ozone 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.

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Ozone Highlights: Moderate Unhealthy for Sensitives Unhealthy Very Unhealthy
Highlight validated data (Validated data has been manually reviewed by a data validator)
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Region	CAMS	Morning						CAMS	POC	Entity
Ozone Hourly Averages for Saturday, May 25, 2013. measured in parts per billion
Region	CAMS	Mid	1:00	2:00	3:00	4:00	5:00	CAMS	POC	Entity
CT-ME-MA-NH-RI-VT - all times are in Eastern Standard Time
	32 ¹	19	25	27	26	23	22	32 ¹	1 ^R	Oth Gov
	1100 ²	25	27	26	23	22	22	1100 ²	1 ^R	Oth Gov


Region	CAMS	Morning						CAMS	POC	Entity
Region	CAMS	Mid	1:00	2:00	3:00	4:00	5:00	CAMS	POC	Entity
NJ-NY-PR-VI - all times are in Eastern Standard Time
	1035 ³	25	24	24	23	23	24	1035 ³	1 ^R	Oth Gov


Region	CAMS	Morning						CAMS	POC	Entity
Region	CAMS	Mid	1:00	2:00	3:00	4:00	5:00	CAMS	POC	Entity
KY-TN-NC-SC-MS-AL-GA-FL - all times are in Eastern Standard Time
	7 ⁴	22	19	16	14	14	14	7 ⁴	1 ^N	Oth Gov


Region	CAMS	Morning						CAMS	POC	Entity
Region	CAMS	Mid	1:00	2:00	3:00	4:00	5:00	CAMS	POC	Entity
CA-NV-AZ-HI-AS-GU - refer to the first data column for each site's specific time zone
PST	1023 ⁵	PMA	PMA	PMA	PMA	PMA	PMA	1023 ⁵	1 ^N	Oth Gov
MST	1030 ⁶	34	35	24	24	19	17	1030 ⁶	1 ^N	Oth Gov
		Notes: ¹- These sites are maintained and operated by Passamaquoddy Tribe at Pleasant Point. ²- These sites are maintained and operated by Penobscot Indian Nation. ³- These sites are maintained and operated by St. Regis Mohawk Tribe. ⁴- These sites are maintained and operated by Eastern Band of Cherokee Indians. ⁵- These sites are maintained and operated by Bishop Paiute Tribe EMO-Air. ⁶- These sites are maintained and operated by Fort McDowell Yavapai Nation. TREX 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.
		^N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes.

PLEASE NOTE: This data has not been verified by TREX 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 TREX 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.

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