Casa de Oro-Mount Helix vs El Cajon
Reading the difference
Both cities have the same historical Clean Air Score. Compare the individual pollution metrics and reporting periods below.
Casa de Oro-Mount Helix, CA
Grade CEl Cajon, CA
Grade CThe history behind the comparison.
Casa de Oro-Mount Helix
Historical perspective
The longer view.
Annual PM2.5 concentrations · µg/m³
Regional reference: El Cajon (2.2 miles away). These historical values are inherited from that location, not measured in Casa de Oro-Mount Helix.
View data table
| Year | PM2.5 |
|---|---|
| 2019 | 8.5 |
| 2020 | 10.5 |
| 2021 | 9.7 |
| 2022 | 9.3 |
| 2023 | 8.5 |
| 2024 | 9.2 |
Available history: 2019–2024. Historical scores are distinct from current AQI and do not describe today’s conditions.
Sources and scoring method ↗El Cajon
Historical perspective
The longer view.
Annual PM2.5 concentrations · µg/m³
View data table
| Year | PM2.5 |
|---|---|
| 2019 | 8.5 |
| 2020 | 10.5 |
| 2021 | 9.7 |
| 2022 | 9.3 |
| 2023 | 8.5 |
| 2024 | 9.2 |
Available history: 2019–2024. Historical scores are distinct from current AQI and do not describe today’s conditions.
Sources and scoring method ↗Casa de Oro-Mount Helix vs El Cajon - Common Questions
Is El Cajon or Casa de Oro-Mount Helix better for air quality?
Both cities have the same historical Clean Air Score. Compare the individual pollution metrics and reporting periods below.
What is the difference in PM2.5 levels between Casa de Oro-Mount Helix and El Cajon?
The stored annual PM2.5 values are 9.1 μg/m³ for Casa de Oro-Mount Helix and 9.1 μg/m³ for El Cajon. Check the historical year labels and any regional-reference notes before comparing.
Does this score measure today’s air?
No. This comparison uses stored historical records. Open each city report to see available current observations, their timestamps and source. Historical scores are not medical assessments.
Can I use this comparison to choose where to live?
It can help compare one environmental factor. It does not predict property values, healthcare costs or personal outcomes. Consider local conditions, data coverage and your other priorities as well.
Compare Other Cities
About This Data
Data Sources
Historical scores use stored EPA-derived city records. Current observations are requested separately and may use monitoring or modelled regional data. Inspect each report’s source and reporting period.
Methodology
Our Clean Air Score (0-100) is a proprietary algorithm that weighs multiple factors:
- Annual PM2.5 averages (40%)
- Frequency of unhealthy days (25%)
- 5-year pollution trends (20%)
- Seasonal variability and extreme events (15%)
Updates & Accuracy
Historical year labels describe the available observations, not the site edition year. Some locations inherit a nearby city’s historical score and are labelled as regional references. Current readings may be unavailable or delayed.
Read the full method
Explore the scoring formula, coverage limitations and data sources. A historical score is not today’s AQI or a personal medical assessment.