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date - Date
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aqs_site_id - a factor with levels 37-063-0015
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poc - a numeric vector
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daily_mean_pm2_5_concentration - a numeric vector
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units - a factor with levels ug/m3 LC
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daily_aqi_value - a numeric vector
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daily_obs_count - a numeric vector
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percent_complete - a numeric vector
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aqs_parameter_code - a numeric vector
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aqs_parameter_desc - a factor with levels Acceptable PM2.5 AQI & Speciation Mass PM2.5 - Local Conditions
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csa_code - a numeric vector
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csa_name - a factor with levels Raleigh-Durham-Cary, NC
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cbsa_code - a numeric vector
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cbsa_name - a factor with levels Durham, NC
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state_code - a numeric vector
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state - a factor with levels North Carolina
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county_code - a numeric vector
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county - a factor with levels Durham
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site_latitude - a numeric vector
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site_longitude - a numeric vector