Good: 250-400 ppm (normal outdoor levels)

Moderate: 400-1000 ppm

Bad: 1000-2000 ppm

Danger: 2000+ ppm - Above 1000 ppm can cause drowsiness; prolonged exposure above 2000 ppm can be dangerous.

Good: 0-10 ppm

Moderate: 10-50 ppm

Bad: 50-100 ppm

Danger: 100+ ppm - Alcohol vapor in confined spaces can pose health risks at higher concentrations.

Good: 0-25 ppm

Moderate: 25-35 ppm

Bad: 35-50 ppm

Danger: 50+ ppm - Ammonia exposure above 35 ppm can cause eye irritation, and at 50 ppm or more, it can cause respiratory issues.

Good: 90-100% of the dangerous concentration levels

Moderate: 75-90% of the dangerous concentration levels

Bad: 50-75% of the dangerous concentration levels

Danger: 0-50% or higher of dangerous concentration levels