AQSQID: 511130003

Site Name: Shenandoah Np

Location: Madison Co, VA

Reporting: True, Located: True

Current AQI: 31.0

Madison Co VA, US: 38.5231, -78.4347

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
May 22, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A N/A 3.3 μg/m3 (14) 31.0
 
May 22, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A N/A 2.8 μg/m3 (12) 30.0
 
May 22, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A N/A 2.6 μg/m3 (11) 30.0
 
May 22, 2019, noon N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A N/A 2.7 μg/m3 (11) 30.0
 
May 22, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A N/A 2.0 μg/m3 (8) 29.0
 
May 22, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A N/A 3.3 μg/m3 (14) 28.0
 
May 22, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A N/A 2.1 μg/m3 (9) 29.0
 
May 22, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A N/A 1.5 μg/m3 (6) 31.0
 
May 22, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A N/A 1.6 μg/m3 (7) 32.0
 
May 22, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A N/A 2.3 μg/m3 (10) 33.0
 
May 22, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A N/A 2.5 μg/m3 (10) 33.0
 
May 22, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A N/A 3.1 μg/m3 (13) 32.0
 
May 22, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A N/A 1.5 μg/m3 (6) 32.0
 
May 22, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 3.0 μg/m3 (12) 34.0
 
May 22, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A N/A 4.4 μg/m3 (18) 35.0
 
May 22, 2019, midnight N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 4.7 μg/m3 (20) 35.0
 
May 21, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 2.0 μg/m3 (8) 35.0
 
May 21, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 0.9 μg/m3 (4) 38.0
 
May 21, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 1.0 μg/m3 (4) 41.0
 
May 21, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 0.4 μg/m3 (2) 44.0
 
May 21, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A -0.7 μg/m3 (0) 41.0
 
May 21, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A -2.5 μg/m3 (0) 40.0
 
May 21, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A N/A 2.1 μg/m3 (9) 36.0
 
May 21, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A N/A 4.7 μg/m3 (20) 33.0
 
May 21, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A N/A 3.7 μg/m3 (15) 29.0
 
May 21, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A N/A 4.7 μg/m3 (20) 28.0
 
May 21, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A N/A 4.4 μg/m3 (18) 28.0
 
May 21, 2019, noon N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A N/A 5.1 μg/m3 (21) 26.0
 
May 21, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A N/A 5.0 μg/m3 (21) 25.0
 
May 21, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A N/A 4.9 μg/m3 (20) 25.0
 
May 21, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A N/A 5.3 μg/m3 (22) 27.0
 
May 21, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A N/A 4.9 μg/m3 (20) 29.0
 
May 21, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A N/A 3.5 μg/m3 (15) 32.0
 
May 21, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A N/A 4.7 μg/m3 (20) 30.0
 
May 21, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A N/A 5.5 μg/m3 (23) 32.0
 
May 21, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 4.6 μg/m3 (19) 34.0
 
May 21, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 4.0 μg/m3 (17) 35.0
 
May 21, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 4.2 μg/m3 (18) 38.0
 
May 21, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 3.5 μg/m3 (15) 39.0
 
May 21, 2019, midnight N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 1.0 μg/m3 (4) 39.0
 
May 20, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 1.4 μg/m3 (6) 41.0
 
May 20, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 0.7 μg/m3 (3) 40.0
 
May 20, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 2.9 μg/m3 (12) 41.0
 
May 20, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 3.6 μg/m3 (15) 38.0
 
May 20, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 3.8 μg/m3 (16) 37.0
 
May 20, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 5.4 μg/m3 (23) 35.0
 
May 20, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A N/A 5.7 μg/m3 (24) 35.0
 
May 20, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A N/A 7.6 μg/m3 (32) 35.0
 
May 20, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 9.1 μg/m3 (38) 38.0
 
May 20, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 8.2 μg/m3 (34) 35.0
 
May 20, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A N/A 8.1 μg/m3 (34) 35.0
 
May 20, 2019, noon N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A N/A 7.5 μg/m3 (31) 35.0
 
May 20, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A N/A 7.8 μg/m3 (32) 35.0
 
May 20, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 7.2 μg/m3 (30) 34.0
 
May 20, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A N/A 7.2 μg/m3 (30) 35.0
 
May 20, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 6.6 μg/m3 (28) 35.0
 
May 20, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 6.2 μg/m3 (26) 37.0
 
May 20, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 5.9 μg/m3 (25) 38.0
 
May 20, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 6.9 μg/m3 (29) 37.0
 
May 20, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 9.4 μg/m3 (39) 39.0
 
May 20, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 9.0 μg/m3 (38) 40.0
 
May 20, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 9.6 μg/m3 (40) 40.0
 
May 20, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 9.6 μg/m3 (40) 40.0
 
May 20, 2019, midnight N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 12.3 μg/m3 (51) 51.0
 
May 19, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 13.1 μg/m3 (52) 52.0
 
May 19, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 12.8 μg/m3 (52) 52.0
 
May 19, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 19, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 10.7 μg/m3 (45) 45.0
 
May 19, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 7.6 μg/m3 (32) 41.0
 
May 19, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A N/A 11.9 μg/m3 (50) 50.0
 
May 19, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 8.7 μg/m3 (36) 37.0
 
May 19, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 13.0 μg/m3 (52) 52.0
 
May 19, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 10.0 μg/m3 (42) 42.0
 
May 19, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 10.2 μg/m3 (42) 42.0
 
May 19, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 10.9 μg/m3 (45) 45.0
 
May 19, 2019, noon N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 9.3 μg/m3 (39) 42.0
 
May 19, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 10.8 μg/m3 (45) 45.0
 
May 19, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 11.6 μg/m3 (48) 48.0
 
May 19, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A N/A 11.2 μg/m3 (47) 47.0
 
May 19, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 9.4 μg/m3 (39) 42.0
 
May 19, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 8.9 μg/m3 (37) 42.0
 
May 19, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 8.5 μg/m3 (35) 41.0
 
May 19, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 7.6 μg/m3 (32) 38.0
 
May 19, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A N/A 7.6 μg/m3 (32) 36.0
 
May 19, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A N/A 8.3 μg/m3 (35) 36.0
 
May 19, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 8.7 μg/m3 (36) 36.0
 
May 19, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A N/A 8.6 μg/m3 (36) 36.0
 
May 19, 2019, midnight N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 18, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 7.5 μg/m3 (31) 42.0
 
May 18, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 12.2 μg/m3 (50) 50.0
 
May 18, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 9.0 μg/m3 (38) 44.0
 
May 18, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 7.7 μg/m3 (32) 42.0
 
May 18, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 8.2 μg/m3 (34) 42.0
 
May 18, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 7.6 μg/m3 (32) 42.0
 
May 18, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 7.8 μg/m3 (32) 42.0
 
May 18, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 7.6 μg/m3 (32) 42.0
 
May 18, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 7.2 μg/m3 (30) 41.0
 
May 18, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 6.5 μg/m3 (27) 42.0
 
May 18, 2019, noon N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 7.2 μg/m3 (30) 41.0
 
May 18, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 6.3 μg/m3 (26) 42.0
 
May 18, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 6.6 μg/m3 (28) 42.0
 
May 18, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 6.6 μg/m3 (28) 42.0
 
May 18, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 6.4 μg/m3 (27) 41.0
 
May 18, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 6.3 μg/m3 (26) 40.0
 
May 18, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 6.0 μg/m3 (25) 39.0
 
May 18, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 7.0 μg/m3 (29) 40.0
 
May 18, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 4.8 μg/m3 (20) 42.0
 
May 18, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 5.0 μg/m3 (21) 42.0
 
May 18, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 5.4 μg/m3 (23) 42.0
 
May 18, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 4.0 μg/m3 (17) 42.0
 
May 18, 2019, midnight N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 7.2 μg/m3 (30) 39.0
 
May 17, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 7.5 μg/m3 (31) 41.0
 
May 17, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 4.5 μg/m3 (19) 42.0
 
May 17, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 4.8 μg/m3 (20) 41.0
 
May 17, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 5.6 μg/m3 (23) 40.0
 
May 17, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 5.4 μg/m3 (23) 40.0
 
May 17, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 5.9 μg/m3 (25) 40.0
 
May 17, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 5.5 μg/m3 (23) 39.0
 
May 17, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 4.8 μg/m3 (20) 39.0
 
May 17, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 3.7 μg/m3 (15) 40.0
 
May 17, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 3.1 μg/m3 (13) 38.0
 
May 17, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 6.0 μg/m3 (25) 38.0
 
May 17, 2019, noon N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 7.5 μg/m3 (31) 38.0
 
May 17, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 7.1 μg/m3 (30) 38.0
 
May 17, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 6.1 μg/m3 (25) 38.0
 
May 17, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 6.6 μg/m3 (28) 42.0
 
May 17, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 5.6 μg/m3 (23) 42.0
 
May 17, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 6.3 μg/m3 (26) 42.0
 
May 17, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 7.4 μg/m3 (31) 41.0
 
May 17, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 7.5 μg/m3 (31) 42.0
 
May 17, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A N/A 6.4 μg/m3 (27) 43.0
 
May 17, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A N/A 6.8 μg/m3 (28) 43.0
 
May 17, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 8.5 μg/m3 (35) 42.0
 
May 17, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 8.6 μg/m3 (36) 42.0
 
May 17, 2019, midnight N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 7.5 μg/m3 (31) 42.0
 
May 16, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A N/A 8.5 μg/m3 (35) 43.0
 
May 16, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A N/A 6.7 μg/m3 (28) 43.0
 
May 16, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 7.3 μg/m3 (30) 44.0
 
May 16, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 6.4 μg/m3 (27) 44.0
 
May 16, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 6.1 μg/m3 (25) 44.0
 
May 16, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 7.5 μg/m3 (31) 44.0
 
May 16, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A N/A 8.0 μg/m3 (33) 43.0
 
May 16, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 10.2 μg/m3 (42) 42.0
 
May 16, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 9.9 μg/m3 (41) 41.0
 
May 16, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 10.9 μg/m3 (45) 45.0
 
May 16, 2019, noon N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 16, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 10.0 μg/m3 (42) 42.0
 
May 16, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A N/A 9.1 μg/m3 (38) 43.0
 
May 16, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A N/A 8.2 μg/m3 (34) 43.0
 
May 16, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 7.0 μg/m3 (29) 44.0
 
May 16, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A N/A 6.5 μg/m3 (27) 43.0
 
May 16, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 6.3 μg/m3 (26) 42.0
 
May 16, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 6.4 μg/m3 (27) 42.0
 
May 16, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 6.4 μg/m3 (27) 42.0
 
May 16, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 6.6 μg/m3 (28) 41.0
 
May 16, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 6.4 μg/m3 (27) 41.0
 
May 16, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 6.0 μg/m3 (25) 39.0
 
May 16, 2019, midnight N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 4.9 μg/m3 (20) 38.0
 
May 15, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 4.7 μg/m3 (20) 37.0
 
May 15, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 4.5 μg/m3 (19) 38.0
 
May 15, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 5.2 μg/m3 (22) 37.0
 
May 15, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 4.0 μg/m3 (17) 37.0
 
May 15, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A N/A 5.2 μg/m3 (22) 36.0
 
May 15, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 4.2 μg/m3 (18) 37.0
 
May 15, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 4.6 μg/m3 (19) 38.0
 
May 15, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 3.8 μg/m3 (16) 37.0
 
May 15, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 4.4 μg/m3 (18) 35.0
 
May 15, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A N/A 5.4 μg/m3 (23) 35.0