Why Are Emissions from Small Engines Harmful?
Small engines used in power equipment emit a variety of pollutants. These include hydrocarbons and oxides of nitrogen (NOx), which lead to the production of ground-level ozone, the principal component of smog. Ozone can impair human lung functions and inhibit plant growth. In addition, NOx contributes to the production of acid rain. These engines also produce carbon monoxide, a colorless, odorless and poisonous gas which results from incomplete fuel combustion. Infants and people with heart disease or respiratory problems are especially sensitive to carbon monoxide poisoning. How Much Cleaner Are the New Engines? Compared to their unregulated counterparts, EPA estimates that engines complying with the new emission standards will emit on average more than one third less hydrocarbons. How Does the Small Engine Rule Work? The regulation (commonly called Phase 1) sets allow-able exhaust levels for hydrocarbons, carbon monoxide, and NOx from small engines of 25 HP or less. The rule applies
