Wildfire smoke Likely
Daily PM2.5 peaked at 32 µg/m³ near Orlando across 1 covered metro home to 2.9 million people.
Counting the extra PM2.5 above each metro's typical day, this event handed the average affected resident ≈ 1.1 cigarettes. Across everyone living in the affected metros, that is the collective equivalent of ≈ 3.3 million cigarettes. An awareness illustration of outdoor exposure at 22 µg/m³ per cigarette (Berkeley Earth), counting only the event's ranked days; not a medical dose.
Why we think this happened
Contemporaneous local reporting on May 30 identifies a 2,000-acre, lightning-caused wildfire near the Orange-Brevard line and describes smoke, haze, reduced visibility, and a smoke smell in East Orlando. That is direct same-day attribution for Orlando. No source located in this pass establishes that the same fire caused Tampa's observation, so Tampa is deliberately excluded from the hypothesis.
Likely Applicable reporting or a supported inference makes this the best current causal explanation.
Spectrum News 13 · May 30, 2017 corroborates
On May 30, Spectrum News reported that the lightning-caused Water Plant Fire had burned about 2,000 acres and that haze, smoke, reduced visibility, and a smoke smell extended into East Orlando.
Evidence path
A cause is more convincing when the record connects three things: something happened, the air mass moved toward the region, and local instruments responded. Here is how much of that chain is documented for this event.
Source or mechanism
On May 30, Spectrum News reported that the lightning-caused Water Plant Fire had burned about 2,000 acres and that haze, smoke, reduced visibility, and a smoke smell extended into East Orlando.
View supporting source ↗Air-mass movement
The retained record does not yet show how air traveled from the proposed source to these metros. A trajectory replay or dated plume analysis belongs here.
Local response
EPA monitors recorded the event across 1 metro. The peak daily concentration is roughly 1.5 cigarette-equivalents at the outdoor daily rate.
Inspect the pollutant and weather signals ↓Event autopsy
Before, during, and after the episode: nearby pollutant monitors and surface-weather stations show what changed. This context tests the “Wildfire smoke” explanation; it does not assign the cause by itself.
Orlando-Kissimmee-Sanford, FL
Monitor comparison window 2017-05-27 to 2017-06-02 · PM2.5 target: WINTER PARK
177% above nearby days
326% higher than surrounding days
177% higher than surrounding days
326% higher than surrounding days
About the same as surrounding days
14% lower than surrounding days
16% higher than surrounding days
32% higher than surrounding days
Tampa-St. Petersburg-Clearwater, FL
Monitor comparison window 2017-05-27 to 2017-06-02 · PM2.5 target: John Chesnut Sr. Park - East Lake
222% above nearby days
8 calm hours observed
0 hours at or below 3 miles
222% higher than surrounding days
209% higher than surrounding days
14% higher than surrounding days
About the same as surrounding days
107% higher than surrounding days
About the same as surrounding days
10 kt maximum · 8 of 24 observed hours calm
0 observed hours at or below 3 miles
73.4°F to 87.8°F
100% maximum
Source: U.S. EPA AirData daily observations and, where available, nearby ASOS/AWOS surface observations. Values are descriptive medians over the retained monitor set; missing measurements remain missing. Transport and source evidence remain separate layers because this instrument pattern does not assign a cause by itself.
Episode peak
-- cigarettes
The smoke map's scale, replayed over this event: the surface interpolates between covered metros' daily records, framed to the affected region. Hover for a reading, click a metro to pin it to the card. Days a monitor did not report draw nothing.
Views from the selected metro
Select a metro on the map to see nearby cameras. Where an operator archive reaches the event, drag the divider to compare two moments, adjust either date and time, or play the available event-day frames. Camera imagery is visual context, not an air-quality measurement or proof of smoke.
No useful public camera views are currently available within 80 km of this metro.
| Metro | Peak PM2.5 | Cigarettes, whole event | Peak day | All-time standing |
|---|---|---|---|---|
| Orlando-Kissimmee-Sanford, FL | 32 µg/m³ | 1.5 | May 30, 2017 | #24 of its top days |
"Cigarettes, whole event" totals a metro's ranked event days at 22 µg/m³ per cigarette: what a person outdoors there breathed across the event, as the illustration. "All-time standing" is where this episode's days sit in each metro's ranked record (worst-area measure, since 1999). Full local context is on each metro's Air Records page.
Public evidence library
Each card states what a source supports—and what it does not. Official records, research, reporting, community observations, and transparent inferences remain visibly different kinds of evidence.
Spectrum News 13
On May 30, Spectrum News reported that the lightning-caused Water Plant Fire had burned about 2,000 acres and that haze, smoke, reduced visibility, and a smoke smell extended into East Orlando.
A retained source supports the attributed cause for the stated place and dates.
The report directly supports Orlando but does not establish an impact in Tampa.
Likely Applicable reporting or a supported inference makes this the best current causal explanation.
This episode was grouped from the monitor record by the catalog pipeline and given its cause from the evidence listed above. It has not been individually reviewed and signed off, so its boundaries, cause, and name may change as evidence accumulates. Grouping policy common_sense_root_cause_grouping.v2. The cause label reflects the assembled evidence above, not an IAQng detection formula. If it is wrong, tell us.