Final answer:
With 750,000 registered automobiles in Toronto, the total NOx emissions are 69.75 tons/day and the total HC emissions are 36 tons/day, both contributing to air pollution and smog.
Step-by-step explanation:
In Toronto, with about 750,000 automobiles registered and an average emission rate of 3.1 grams of nitrogen oxides (NOx) per vehicle mile and 1.6 grams of hydrocarbons (HC) per vehicle mile, we can calculate the total daily emissions. Considering that each car travels approximately 30 miles per working day, the calculations are as follows:
- Total NOx emissions per day = 750,000 cars x 3.1 g/vm x 30 vm = 69,750,000 g/day
- Total HC emissions per day = 750,000 cars x 1.6 g/vm x 30 vm = 36,000,000 g/day
To convert these values into tons, we use the conversion factor that 1 ton = 1,000,000 grams:
- Total NOx emissions per day in tons = 69,750,000 g/day / 1,000,000 = 69.75 tons/day
- Total HC emissions per day in tons = 36,000,000 g/day / 1,000,000 = 36 tons/day
It should be noted that these emissions contribute significantly to air pollution and the formation of smog, particularly in urban environments. Furthermore, NOx emissions are a primary factor in the formation of ground-level ozone, which can lead to various health issues.