Trees:
* Conifers: Pine, fir, spruce, cedar, and hemlock are particularly vulnerable to SO2 damage. This can manifest as needle browning, premature needle drop, and stunted growth.
* Deciduous trees: Maple, oak, birch, and willow can also be harmed by SO2, often showing leaf chlorosis (yellowing), necrosis (tissue death), and reduced growth.
Other plants:
* Grasses: SO2 can lead to chlorosis, necrosis, and reduced growth in grasses.
* Agricultural crops: Wheat, barley, oats, and other grains can be negatively impacted by SO2, affecting yield and quality.
* Vegetables: SO2 can damage leaves and reduce yields in vegetables such as lettuce, spinach, and tomatoes.
* Flowers: Some flower species, like roses and petunias, are susceptible to SO2 damage, leading to discoloration and wilting.
Factors influencing sensitivity:
* Plant species: Some plant species are inherently more sensitive to SO2 than others.
* Concentration of SO2: The higher the concentration of SO2 in the air, the more severe the damage.
* Duration of exposure: Prolonged exposure to even low levels of SO2 can cause damage.
* Environmental conditions: Factors like temperature, humidity, and light intensity can influence plant sensitivity.
It's important to note that the impact of SO2 on plants can vary depending on the specific plant species, the level of pollution, and other environmental factors.
Resources for more information:
* United States Environmental Protection Agency (EPA): The EPA has a wealth of information on air pollution, including the effects of SO2 on plants.
* National Park Service: The National Park Service has resources on the effects of air pollution on plants in national parks.
* The Nature Conservancy: The Nature Conservancy works to protect ecosystems and habitats, including those impacted by air pollution.
