Description: The trend metric is the annual precipitation-weighted mean wet sulfate concentration. All improving and deteriorating trends have at least 90% probability of being correct (those with p-values ≤ 0.10). Statistically significant (p-value ≤ 0.10) trends with zero slope are represented as unchanging trends. Parameters with no statistically significant trend (p-value ≥ 0.10) are also represented as unchanging trends. See NPS air quality analysis methods for more information: https://www.nps.gov/articles/air-analysis-methods-latest.htm.
Description: Sulfur conditions use the sulfur portion of wet sulfate deposition. Condition categories (good, fair, poor) are based on the estimated five-year average of this value compared to NPS Air Resources Division benchmarks . Deposition values for each NPS area are the maximum estimated or monitor-specific 5-year average of wet sulfur deposition. Condition assessments rely on maximum estimated values to more conservatively characterize ecosystem sensitivity in parks. Wet deposition greater than 3 kg/ha/yr is assigned a Poor condition. Wet deposition from 1–3 kg/ha/yr is assigned Fair condition. A Good condition is identified when wet deposition is less than less than 1 kg/ha/yr. Condition adjustments: Sulfur deposition condition is adjusted based on results from national assessment reports that identified ecosystems and resources at risk to acidification in national parks. See NPS air quality analysis methods for more information: https://www.nps.gov/articles/air-analysis-methods-latest.htm.
Description: The trend metric is the annual precipitation-weighted mean wet ammonium concentration. All improving and deteriorating trends have at least 90% probability of being correct (those with p-values ≤ 0.10). Statistically significant (p-value ≤ 0.10) trends with zero slope are represented as unchanging trends. Parameters with no statistically significant trend (p-value ≥ 0.10) are also represented as unchanging trends. See NPS air quality analysis methods for more information: https://www.nps.gov/articles/air-analysis-methods-latest.htm.
Description: <p>The trend metric is the annual precipitation-weighted mean wet nitrate concentration. All improving and deteriorating trends have at least 90% probability of being correct (those with p-values ≤ 0.10). Statistically significant (p-value ≤ 0.10) trends with zero slope are represented as unchanging trends. Parameters with no statistically significant trend (p-value ≥ 0.10) are also represented as unchanging trends. See NPS air quality analysis methods for more information: https://www.nps.gov/articles/air-analysis-methods-latest.htm.</p>
Description: The trend metric is the annual precipitation-weighted mean concentration of the nitrogen portion of wet nitrate and ammonium. All improving and deteriorating trends have at least 90% probability of being correct (those with p-values ≤ 0.10). Statistically significant (p-value ≤ 0.10) trends with zero slope are represented as unchanging trends. Parameters with no statistically significant trend (p-value ≥ 0.10) are also represented as unchanging trends. See NPS air quality analysis methods for more information: https://www.nps.gov/articles/air-analysis-methods-latest.htm.
Description: Nitrogen conditions use the nitrogen portion of wet nitrate and ammonium deposition. Condition categories (good, fair, poor) are based on the estimated five-year average of this value compared to NPS Air Resources Division benchmarks. Deposition values for each NPS area are the maximum estimated or monitor-specific 5-year average of wet nitrogen deposition. Condition assessments rely on maximum estimated values to more conservatively characterize ecosystem sensitivity in parks. Wet deposition greater than 3 kg/ha/yr is assigned a Poor condition. Wet deposition from 1–3 kg/ha/yr is assigned Fair condition. A Good condition is identified when wet deposition is less than less than 1 kg/ha/yr. Condition adjustments: Nitrogen deposition condition is adjusted based on results from national assessment reports that identified ecosystems and resources at risk to nitrogen enrichment in national parks. See NPS air quality analysis methods for more information: https://www.nps.gov/articles/air-analysis-methods-latest.htm.
Description: <font face="Calibri, sans-serif"><span style="font-size:14.6667px;">The trend metric is the annual 3-month maximum 12-hour W126, which relates plant response to cumulative ozone exposure. All improving and deteriorating trends have at least 90% probability of being correct (those with p-values ≤ 0.10). Statistically significant (p-value ≤ 0.10) trends with zero slope are represented as unchanging trends. Parameters with no statistically significant trend (p-value ≥ 0.10) are also represented as unchanging trends. See NPS air quality analysis methods for more information: https://www.nps.gov/articles/air-analysis-methods-latest.htm.</span></font>
Description: Ozone vegetation health conditions use the 3-month maximum 12-hour W126 ozone metric, which relates plant response to cumulative ozone exposure. Condition categories (good, fair, poor) are based on the estimated five-year average of this metric compared to NPS Air Resources Division benchmarks. Ozone values for each NPS area are the estimated or monitor-specific 5-year average of the 3-month maximum 12-hour W126 index. A W126 index greater than 13 ppm-hrs is assigned a Poor condition. A W126 index from 7–13 ppm-hrs is assigned Fair condition. A Good condition is identified when W126 index is less than 7 ppm-hrs. See NPS air quality analysis methods for more information: https://www.nps.gov/articles/air-analysis-methods-latest.htm.
Description: The trend metric is the annual fourth-highest daily maximum 8-hour average ozone concentration. All improving and deteriorating trends have at least 90% probability of being correct (those with p-values ≤ 0.10). Statistically significant (p-value ≤ 0.10) trends with zero slope are represented as unchanging trends. Parameters with no statistically significant trend (p-value ≥ 0.10) are also represented as unchanging trends. See NPS air quality analysis methods for more information: https://www.nps.gov/articles/air-analysis-methods-latest.htm.
Description: Ozone human health conditions use the fourth-highest daily maximum 8-hour average ozone concentration. Condition categories (good, fair, poor) are based on the estimated five-year average of this value compared to NPS Air Resources Division benchmarks . Ozone values for each NPS area are the estimated or monitor-specific 5-year average of the 4th-highest daily maximum 8-hour average ozone. Ozone concentrations greater than or equal to 71.0 ppb are assigned a Poor condition. Ozone concentrations from 55.0–70.9 ppb are assigned Fair condition. A Good condition is identified when ozone concentrations are less than or equal to 54.9 ppb. See NPS air quality analysis methods for more information: https://www.nps.gov/articles/air-analysis-methods-latest.htm.
Description: The trend metric is the annual average haze index on the clearest days. Clearest days are the 20% of sampled days where visibility is most clear. All improving and deteriorating trends have at least 90% probability of being correct (those with p-values ≤ 0.10). Statistically significant (p-value ≤ 0.10) trends with zero slope are represented as unchanging trends. Parameters with no statistically significant trend (p-value ≥ 0.10) are also represented as unchanging trends. See NPS air quality analysis methods for more information: https://www.nps.gov/articles/air-analysis-methods-latest.htm.
Description: <font face="Calibri, sans-serif" size="3">The trend metric is the annual average haze index on the haziest days. Haziest days are the 20% of sampled days where visibility is most limited. All improving and deteriorating trends have at least 90% probability of being correct (those with p-values ≤ 0.10). Statistically significant (p-value ≤ 0.10) trends with zero slope are represented as unchanging trends. Parameters with no statistically significant trend (p-value ≥ 0.10) are also represented as unchanging trends. See NPS air quality analysis methods for more information: https://www.nps.gov/articles/air-analysis-methods-latest.htm.</font>
Description: Visibility conditions use the difference between visibility (haze index) on mid-range days and the natural conditions. Condition categories (good, fair, poor) are based on the estimated five-year average of this value compared to NPS Air Resources Division benchmarks. Visibility values for each NPS area are the estimated or monitor-specific 5-year average of the haze index on mid-range days minus the natural visibility on mid-range days. A result greater than 8 dv is assigned a Poor condition. A result from 2–8 dv is assigned Fair condition. A Good condition is identified when the result is less than 2 dv. See NPS air quality analysis methods for more information: https://www.nps.gov/articles/air-analysis-methods-latest.htm.