Ozone is an important pollutant that causes respiratory discomfort, 
triggers asthma attacks, and may increase the risk of developing asthma.  
It is produced from various components of car exhaust by chemical 
reactions in the air, powered by sunlight.  These chemical reactions 
proceed faster at higher temperatures.

Predictions of ozone concentrations from forecast weather conditions are 
useful for public health purposes (ozone alerts).  Statistical models of 
ozone levels may also be useful for validating physical/chemical models.

The data set contains measurements from the summer of 1973 in New York 
City

Ozone:  mean concentration of Ozone (ppb) at Roosevelt Island for the 
	period 1pm to 3pm each day

Solar:	Solar radiation (Langleys) in the range 4000-7700 Angstrom 
        (roughly the visible range) from 8am to noon at Central Park

Wind:	Average wind speed in miles per hour at 7am and 10am, at La 
	Guardia airport

Temp:	Maximum daily temperature (Fahrenheit) at La Guardia airport

Month:	Month

Day:	Day of Month