Air Quality Trends
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AIR QUALITY TRENDS
The concentration of ozone in the Houston area has steadily declined but is still above the federal standard. Concentration of ozone in parts per billion
120
110
119 91
100 90
84 Federal limit for ozone
80 ’91 ’92 ’93 ’94 ’95 ’96 ’97 ’98 ’99 ’00 ’01 ’02 ’03 ’04 ’05 ’06 ’07 ’08 Source: Texas Commission on Environmental Quality
CHRONICLE
The concentration of ozone in the Houston area has steadily declined but is still above the federal standard. Concentration of ozone in parts per billion
120
110
119 91
100 90
84 Federal limit for ozone
80 ’91 ’92 ’93 ’94 ’95 ’96 ’97 ’98 ’99 ’00 ’01 ’02 ’03 ’04 ’05 ’06 ’07 ’08 Source: Texas Commission on Environmental Quality
CHRONICLE
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