Interpreting notation format 1.64E-02 from particulate emission data
The format refers to a quite common scientific notation, where the $\mathrm{E}$ refers to exponent of $10$. It is often used when superscripted values become tedious to read and or write. It is widely known in computational sciences and was introduced for an easier display of huge or tiny numbers.

You can interpret the $\mathrm{E}$ as "times ten raised to the power of", hence the format can be interpreted like this: $$n\mathrm{E}m = n\times10^{m}$$

Therefore $1.64\mathrm{E}-02 = 1.64\times10^{-02}= 0.0164$ or $2.25\mathrm{E}+00=2.25\times10^0=2.25$.