GHASP operates several ozone monitors in suburban Houston areas. These monitors are intended to fill gaps in the state's official ozone monitoring network.

Daily maximum ozone (1-hr and 8-hr values)

Ozone measurement units are parts per billion. "FEW" means not enough data to create an average. "NOL" means the ozone monitor is not reporting data for some reason.

EPA Air Quality Index for Ozone

	Ozone 1-hour average	Ozone 8-hour average
	> 404 ppb	>374 ppb
	205 - 404 ppb	125 - 374 ppb
	165 - 204 ppb	105 - 124 ppb
	125 - 164 ppb	85 - 104 ppb
	(use 8-hr avg)	65 - 84 ppb
	(use 8-hr avg)	0 - 64 ppb

GHASP's ozone monitors have been verified in direct comparison with official city and state ozone monitors, and are suitable for use as a public health awareness tool.