Fine particulate matter is perhaps the most alarming issue when it comes to global air quality. These particles are very harmful and cause millions of premature deaths each year.

Nitrogen dioxide (NO2) is a major component of NOx and an important factor for the buildup of Smog and ground level Ozone. It also contributes to acidification and eutrophication of aquatic ecosystems.

Carbon oxide (CO) is a toxic, colourless and odourless gas that is formed when burning carbon-based fuels in low-oxygen conditions. The CO situation has improved, but there are still problems in parts of the world.

Ground level ozone is harmful to the respiratory system and is estimated to cause about a million premature deaths each year. It is also harmful to plants and one of the major components in smog.

Sulfur Dioxide is a gas that's emitted mainly through burning sulfur containing fuels (fossil and bio). SO2 is harmful for the human respiratory system and contribute to PM buildup.

Pot holes cause a lot of problems for vehicles and tires, with high associated costs. But much worse, they can cause crashes and are the cause of many fatal accidents each year.